Guevara Robles v Canada 2026 FC 1134: Res Judicata, s. 15(b) IRPR, and Why the IAD Must Actually Engage

By Dimple Verma, RCIC-IRB R708308 — VG Immigration Services Inc.
Published September 18, 2026

Overview: two tribunals, one applicant, opposite outcomes

On September 9, 2026, the Federal Court released Guevara Robles v Canada (Citizenship and Immigration), 2026 FC 1134. Madam Justice Ngo granted judicial review of an Immigration Appeal Division (IAD) decision that had found Mr. Guevara Robles inadmissible to Canada under paragraph 35(1)(a) of the Immigration and Refugee Protection Act for complicity in crimes against humanity. The Court set aside the IAD decision and remitted the matter to a differently-constituted IAD for reconsideration.

What makes this decision important — and worth publishing in full for our readers — is that it was not a fight about the underlying facts. The parties largely agreed on those. It was a fight about a much harder question that quietly runs through the entire Canadian immigration system:

When two divisions of the Immigration and Refugee Board — the Refugee Appeal Division and the Immigration Appeal Division — hear substantially the same evidence about the same person, does the second tribunal have to accept what the first tribunal already decided?

The specific answer will come back to the IAD on reconsideration. But Guevara Robles tells every practitioner, every applicant, and every officer something important right now: an administrative decision-maker cannot dispose of a serious argument on res judicata and issue estoppel by reading a regulation on its plain text alone.

The facts the parties agreed on

Mr. Guevara Robles is a citizen of El Salvador. He began working, as a child, for a man named “William” — first as a paid welding assistant at age 12, and then, from age 15, helping with the equipment for a travelling mobile discotheque called “Project 2.” He later learned that the discotheque was a cover: Project 2 was in fact being used by the Salvadoran military to gather information on suspected Farabundo Martí National Liberation Front (FMLN) guerrillas, and at least one family that Project 2 informed on was killed.

In December 1991, at age 17, he was captured and tortured by guerrillas for 15 days. After his release, his family made him leave the country. He entered the United States in 1992, lived without status for over 30 years, spent time in a California jail — where, he says, he was forced to pass messages for gang-affiliated inmates — and arrived in Canada to seek protection in 2022.

From January 2023 forward, four different tribunals looked at what all of this meant for his immigration status.

The tribunal history: RPD, ID, RAD, IAD

These four proceedings are worth setting out clearly, because they are the whole point of the case:

1. Refugee Protection Division (RPD) — dealt with his refugee claim, including whether he was excluded under Article 1F(a) of the Refugee Convention (complicity in crimes against humanity).
2. Immigration Division (ID) — on July 24, 2023, IRCC issued a section 44 report alleging inadmissibility under paragraph 35(1)(a) of the IRPA. On October 31, 2023, the ID found he was not inadmissible.
3. Refugee Appeal Division (RAD) — on November 9, 2023, the RAD overturned the RPD and granted his refugee claim, finding that although Mr. Guevara Robles had made significant and knowing contributions to Salvadoran military and death-squad crimes, his contribution was not voluntary and he was therefore not complicit. The Minister sought judicial review; the Federal Court dismissed it on April 28, 2025 (Canada (Citizenship and Immigration) v Guevara Robles, 2025 FC 761), confirming that the RAD had reasonably applied the Ezokola factors.
4. Immigration Appeal Division (IAD) — on March 7, 2025, the IAD went the other way. It re-analyzed the Ezokola factors, disagreed with the ID’s conclusion, and found the contribution was voluntary despite the applicant’s young age at the time. A deportation order followed.

So the same person, on essentially the same evidence, was told by one arm of the Board that he was not complicit in crimes against humanity (RAD), and by another arm of the Board that he was (IAD). It is that split that Justice Ngo was asked to review.

The legal question: does section 15 of the IRPR bind the IAD?

The heart of the case is section 15 of the Immigration and Refugee Protection Regulations, and specifically paragraph 15(b). Section 15 is a small but powerful rule about when findings made in one immigration proceeding become conclusive in another.

The regulation reads, in relevant part (section 15, IRPR):

Application of paragraph 35(1)(a) of the Act

15. For the purpose of determining whether a foreign national or permanent resident is inadmissible under paragraph 35(1)(a) of the Act, if any of the following decisions or the following determination has been rendered, the findings of fact set out in that decision or determination shall be considered as conclusive findings of fact:

  (a) a decision concerning the foreign national or permanent resident that is made by any international criminal tribunal … or the International Criminal Court …;

  (b) a determination by the Board, based on findings that the foreign national or permanent resident has committed a war crime or a crime against humanity, that the foreign national or permanent resident is a person referred to in section F of Article 1 of the Refugee Convention; or

  (c) a decision by a Canadian court under the Criminal Code or the Crimes Against Humanity and War Crimes Act concerning the foreign national or permanent resident and a war crime or crime against humanity committed outside Canada.

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Mr. Guevara Robles argued that this evidentiary rule cuts both ways: if the RAD’s positive finding of exclusion would bind the IAD, then the RAD’s negative finding of non-exclusion — that his contribution was not voluntary and he was not complicit — should also be treated as a conclusive finding of fact in the IAD’s admissibility hearing. He also raised the common-law doctrines of res judicata and, more specifically, issue estoppel, as summarized by the Supreme Court in Danyluk v Ainsworth Technologies Inc, 2001 SCC 44.

The Minister argued the reverse: the plain text of paragraph 15(b) uses the words “has committed,” not “has not committed.” On the Minister’s reading, section 15 is a one-way ratchet against the applicant — it only turns positive Board findings of complicity into conclusive facts. Anything else is fair game for the IAD to reweigh de novo.

The IAD accepted the Minister’s reading. It found paragraph 15(b) did not require it to treat the RAD’s finding of non-exclusion as conclusive; it said the jurisprudence was silent on the reverse; it inferred that if Parliament had wanted the regulation to apply when the Board had found the crime was not committed, Parliament would have said so; and it moved on to conduct its own Ezokola analysis, reaching the opposite conclusion.

Why the Federal Court set the decision aside

Justice Ngo was careful about what she was and was not deciding. She did not decide that the RAD’s findings must bind the IAD. She did not decide the correct interpretation of paragraph 15(b). She expressly reserved both questions for the IAD on reconsideration (at para. 55).

What she decided was more targeted, and more important for administrative-law practice generally: the IAD’s reasoning was not a complete statutory-interpretation exercise, and it did not engage with the applicant’s central common-law argument on issue estoppel. On the reasonableness standard set out in Canada (Minister of Citizenship and Immigration) v Vavilov, 2019 SCC 65, that is enough to send the decision back.

1. Plain reading is not enough

Justice Ngo relied on the modern principle of statutory interpretation as most recently reiterated by the Supreme Court in Piekut v Canada (National Revenue), 2025 SCC 13 and Pepa v Canada (Citizenship and Immigration), 2025 SCC 21: statutory language must be read according to a textual, contextual, and purposive analysis, and “plain meaning alone is not determinative” (paras. 50–51).

The IAD acknowledged that the purpose of section 15 is to avoid re-litigation. That is a purposive point in the applicant’s favour. It then jumped to the plain text of paragraph 15(b), pointed out that the text says “has committed” and not “has not committed,” and stopped there. It did not explain why the purpose of the section — avoiding re-litigation — should be read to run in only one direction. It did not consider whether reading the regulation as one-way is harmonious with the scheme of the IRPA and IRPR as a whole. It did not confront the fact that the Federal Court had already dismissed the Minister’s own judicial review of the RAD decision (Guevara Robles, 2025 FC 761), meaning the RAD’s findings on complicity were, in the sense that matters most in this system, judicially reviewed and reasonable.

As Justice Ngo put it, “the omission of any other analysis by the IAD beyond the plain reading of the section is sufficient to cause the Court to lose confidence in the outcome” (para. 54).

2. Silence on issue estoppel is a Vavilov problem

The applicant did not simply argue paragraph 15(b) of the IRPR. He also argued issue estoppel, applying the three-part test set out by the Supreme Court in Danyluk at paragraph 33 (citing Angle v Minister of National Revenue, 1974 CanLII 168): (a) the same question was decided; (b) the earlier decision was final; and (c) the parties (or their privies) were the same. If those preconditions are met, the tribunal must still exercise its discretion on whether to actually apply the doctrine.

The Minister argued each Danyluk factor before the Federal Court on judicial review. The problem, Justice Ngo found, is that the IAD’s decision itself said nothing about any of them (para. 59). None of the Danyluk preconditions were identified. The discretionary second stage was not addressed. And as the Court has said many times, it is not the role of the reviewing court — or of Justice counsel on JR — to buttress reasons the tribunal did not give (para. 59).

That silence, Justice Ngo held, is a failure of “responsive justification” as described in Mason v Canada (Citizenship and Immigration), 2023 SCC 21, at paragraph 10 — and it takes on additional weight where the decision “has particularly harsh consequences for the affected individual,” here a deportation order (para. 61, citing Vavilov at paras. 133–135).

3. Vavilov, harsh consequences, and stakes

The last point is worth underscoring. Vavilov‘s “responsive justification” principle is not just decorative. It says explicitly that where an administrative decision “has particularly harsh consequences for the affected individual, the decision-maker must explain why its decision best reflects the legislature’s intention.” A finding of inadmissibility for complicity in crimes against humanity, resulting in a deportation order, is at the top of that scale. The reasons need to reflect the stakes. In Guevara Robles, they did not.

What Guevara Robles establishes, and what it does not

It is important to be precise. This decision does not:

• hold that the RAD’s negative Article 1F(a) findings automatically bind the IAD in a paragraph 35(1)(a) inadmissibility hearing;
• hold that paragraph 15(b) of the IRPR applies to negative Board findings;
• decide whether Mr. Guevara Robles was complicit or not; or
• disturb the RAD’s underlying finding on voluntariness.

What it does establish:

• An IAD panel that dismisses a section 15 IRPR argument by pointing to the words “has committed” and stopping there has not done the interpretive work Vavilov requires.
• An IAD panel that fails to run — even briefly — the Danyluk preconditions and the discretionary second stage of issue estoppel has committed a reviewable error where the applicant clearly raised those arguments.
• In inadmissibility cases with severe consequences (deportation, complicity in war crimes or crimes against humanity), the level of justification the tribunal owes the applicant is at its highest end.

Practical takeaways for counsel and applicants

For applicants and counsel appearing before the IAD

If your client has been the subject of parallel or successive IRB proceedings — for example, an RPD/RAD refugee claim in one direction and an ID/IAD admissibility proceeding in the other — the paragraph 15 IRPR and issue-estoppel arguments have to be raised expressly and in detail. That means:

• Identify every RAD or RPD finding of fact you say should be treated as conclusive under paragraph 15(b) — quote the paragraphs, attach the reasons, and explain how each finding meets the section’s text and purpose.
• Run the full Danyluk analysis in writing: which question was decided, whether the earlier decision is final (including any Federal Court dismissal of a JR), and whether the parties or their privies are the same. Then argue the discretionary factors head-on.
• Address the modern principle of statutory interpretation. Do not just cite the words; explain how the scheme of the IRPA, the anti-relitigation purpose of section 15, and the harsh consequences of a 35(1)(a) finding all pull in favour of your reading.
• Make the record on responsive justification: name the stakes. A deportation order for complicity in crimes against humanity is exactly the kind of “particularly harsh consequence” that Vavilov and Mason flag for heightened reasons.

For officers and Minister’s counsel

The other side of this ruling is equally practical. It is not enough to answer an issue-estoppel argument only in oral submissions or in JR pleadings. The tribunal itself must show its work. If Minister’s counsel invites the IAD to distinguish RAD findings, the record should make clear that the IAD engaged with the doctrine and the statutory text — and rejected them for reasons — rather than simply reciting the words of the regulation.

For applicants generally

Immigration cases often involve multiple proceedings — refugee claims, admissibility hearings, appeals, judicial reviews, humanitarian and compassionate applications, pre-removal risk assessments. Findings made in one file can and often do have real weight in later files, but only if they are properly identified and argued. This is one of the reasons continuity of counsel and a well-maintained file history matter so much. A conclusion you won at the RAD is worth very little if nobody raises it, in the right form and at the right time, at the next tribunal.

Where Guevara Robles fits with the other September 2026 decisions

This is the fourth Federal Court decision released in early September 2026 that VG Immigration has written about, and together they form a useful teaching set on the state of reasonableness review after Vavilov, Mason, and now Pepa and Piekut:

• Yilbas v Canada, 2026 FC 1139 — PR-card renewal refusal set aside where the officer’s reasons ignored a returning-resident record of examination.
• Kumar v Canada, 2026 FC 1138 — TRV refusal set aside where the officer misread the applicant’s evidence of ties.
• Towsif v Canada, 2026 FC 1137 — LMIA-supported cook work permit refusal upheld under s. 200(3)(a) IRPR: a positive LMIA does not bind an officer, and a CV alone did not evidence the full NOC duty set.
• Guevara Robles v Canada, 2026 FC 1134 — IAD’s paragraph 35(1)(a) inadmissibility decision set aside for failing to engage with paragraph 15(b) IRPR and with issue estoppel.

The unifying thread is Vavilov’s demand for reasoning that actually engages with the arguments and the record. Officers who ignore evidence lose. Tribunals that skip the interpretive analysis lose. Tribunals that meet the arguments head-on, even in refusing them, tend to win. That is as true for a routine work-permit refusal as it is for a crimes-against-humanity inadmissibility file.

Frequently asked questions

What does paragraph 35(1)(a) of the IRPA cover?

Paragraph 35(1)(a) of the Immigration and Refugee Protection Act makes a foreign national or permanent resident inadmissible to Canada for “committing an act outside Canada that constitutes an offence referred to in sections 4 to 7 of the Crimes Against Humanity and War Crimes Act.” That includes complicity in war crimes, crimes against humanity, and genocide. It is one of the most serious inadmissibility grounds in Canadian immigration law and typically leads to a deportation order if made out.

What is the Ezokola test?

In Ezokola v Canada (Citizenship and Immigration), 2013 SCC 40, the Supreme Court set out the modern test for complicity in international crimes. Complicity requires a voluntary, knowing, and significant contribution to the crime or criminal purpose of a group. The Court listed non-exhaustive factors, including the size and nature of the organization, the part of the organization the person was involved with, the person’s position or rank, duties and activities, length of time with the organization (especially after becoming aware of the criminal purpose), method of recruitment, and the person’s opportunity to leave.

What is section 15 of the IRPR, and why is it important?

Section 15 of the Immigration and Refugee Protection Regulations is an evidentiary rule. It says that for the purpose of determining paragraph 35(1)(a) inadmissibility, findings of fact made by certain international tribunals, the Immigration and Refugee Board (in the Article 1F exclusion context), and Canadian courts under the Criminal Code or Crimes Against Humanity and War Crimes Act “shall be considered as conclusive findings of fact.” It is meant to avoid relitigating the same complicity questions in successive proceedings.

What is issue estoppel, and how did it come up in Guevara Robles?

Issue estoppel is a branch of the common-law doctrine of res judicata. Under the test in Danyluk v Ainsworth Technologies Inc, 2001 SCC 44, at paragraph 33, the party invoking it must show that the same question was decided in an earlier proceeding, that the earlier decision was final, and that the parties or their privies were the same. If those preconditions are met, the tribunal must still decide, as a matter of discretion, whether to apply the doctrine in the circumstances of the case. In Guevara Robles, the applicant argued that the RAD’s finding on voluntariness — and the fact that the Federal Court had already upheld it on judicial review — satisfied that test.

Did the Federal Court decide that the applicant was not inadmissible?

No. Justice Ngo was careful to say that she was making no determination on whether paragraph 15 of the IRPR applies to negative Board findings or on the merits of the Ezokola analysis. She sent the matter back to a differently-constituted IAD panel to reconsider in accordance with her reasons — meaning the IAD must now engage properly with both the statutory interpretation of paragraph 15(b) and the issue-estoppel argument.

What is the reasonableness standard from Vavilov, and how did it apply here?

The Supreme Court’s reasonableness framework, set out in Canada (Minister of Citizenship and Immigration) v Vavilov, 2019 SCC 65, requires administrative decisions to bear the hallmarks of “justification, transparency and intelligibility” and to be justified in light of the relevant facts and legal constraints. Later cases including Mason, Pepa, and Piekut reinforce that where reasons are unresponsive to central arguments, or where a decision has particularly harsh consequences, the level of justification required is correspondingly higher. In Guevara Robles, the IAD’s reasons failed both because the statutory interpretation was incomplete and because there was no engagement with issue estoppel.

How can VG Immigration help with these files?

We work with clients facing s. 35(1)(a) allegations, complex admissibility hearings, IAD appeals, and files where earlier RPD or RAD findings may support (or complicate) a later stage of the immigration process. That includes strategy on how to plead paragraph 15 IRPR and common-law res judicata/issue-estoppel arguments, and how to preserve a record that supports later judicial review if necessary. To discuss a specific file, Book a Consultation.

Sources

• Guevara Robles v Canada (Citizenship and Immigration), 2026 FC 1134 (Federal Court, September 9, 2026) — CanLII
• Canada (Citizenship and Immigration) v Guevara Robles, 2025 FC 761 — CanLII
• Immigration and Refugee Protection Act, SC 2001, c 27, s. 35(1)(a) — Justice Laws
• Immigration and Refugee Protection Regulations, SOR/2002-227, s. 15 — Justice Laws
• Crimes Against Humanity and War Crimes Act, SC 2000, c 24 — Justice Laws
• Ezokola v Canada (Citizenship and Immigration), 2013 SCC 40 — CanLII
• Canada (Minister of Citizenship and Immigration) v Vavilov, 2019 SCC 65 — CanLII
• Mason v Canada (Citizenship and Immigration), 2023 SCC 21 — CanLII
• Piekut v Canada (National Revenue), 2025 SCC 13 — CanLII
• Danyluk v Ainsworth Technologies Inc, 2001 SCC 44 — CanLII
• IRB — Immigration Appeal Division: role and jurisdiction — irb-cisr.gc.ca

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