Cardoza-Fonseca: You Do Not Have to Prove You Will Probably Be Persecuted

You are afraid to go home. You cannot say that you will be arrested, only that people like you have been, and that someone may come looking. A lawyer or an official tells you that you have to prove persecution is more likely than not. For asylum, that is wrong.

To win asylum based on future danger, you need a genuine fear and evidence of a reasonable possibility that you would be persecuted because of your race, religion, nationality, political opinion or membership in a particular social group. The danger does not have to be probable. Someone who has already been persecuted for one of those reasons has a separate path. A different protection, withholding of removal, does require proof that persecution is more likely than not, and an applicant usually asks for both. So the same evidence can fall short for one and be enough for the other, which is why it matters which test the judge used.

The rule comes from INS v. Cardoza-Fonseca, 480 U.S. 421 (1987), No. 85-782, decided March 9, 1987. Luz Marina Cardoza-Fonseca asked the courts to measure her asylum claim by the statute’s own words rather than by the stricter test used for withholding. The Supreme Court agreed that the two tests differ. The vote was 6–3. Justice Stevens wrote for five justices, Justice Scalia agreed with the result for narrower reasons, and three justices dissented.

A sister, a brother and one standard for two claims

Cardoza-Fonseca came from Nicaragua in 1979 as a visitor and stayed past her permitted time. In deportation proceedings she admitted she was here illegally and asked for two things: withholding of deportation and asylum.

Her evidence was mostly about her brother, who had been tortured and imprisoned for his political activities. She and her brother testified that they believed the Sandinistas knew the two had fled together. Although she had not been politically active herself, she expected to be interrogated about him, and she said her own opposition to the government would come to its attention because of who he was.

The immigration judge used one test for both claims and found she had not shown “a clear probability of persecution.” The Board of Immigration Appeals agreed. In the Ninth Circuit she gave up the withholding claim and fought only on asylum, arguing that the wrong standard had been applied. She won, and the government sought review.

Two forms of protection, two different promises

Since 1980 the immigration law has offered two routes. Congress kept the older withholding standard and made that protection mandatory, and in the same Act it wrote a new, differently worded standard for asylum. Withholding, then section 243(h), forbids sending a person to a country where his “life or freedom would be threatened” on a protected ground. Three years before this case, in INS v. Stevic, the Court held that this means proving persecution is more likely than not.

Asylum, section 208(a), is different. It lets the Attorney General, “in his discretion,” grant asylum to a refugee, and a refugee is someone unable or unwilling to return “because of persecution or a well-founded fear of persecution” on a protected ground. The government’s position was that the two phrases mean the same thing, so the only way to show a well-founded fear was to prove a clear probability.

What the words “well-founded fear” mean

The Court started with the language. “Would be threatened” has no subjective element. It asks for objective proof. “Fear” necessarily turns in part on the person’s state of mind. Adding “well-founded” requires a basis for the fear, but it does not convert the test into a probability. “One can certainly have a well-founded fear of an event happening when there is less than a 50% chance of the occurrence taking place.”

To show this, the Court borrowed an example from a leading treatise. Suppose that in a country every tenth adult man is put to death or sent to a remote labor camp. Anyone who escaped, the author wrote, would plainly have a well-founded fear of being persecuted on returning. The Court later said there is “simply no room” in the international definition for concluding that someone with only a 10% chance of being shot or tortured has no well-founded fear, and it drew on a passage from Stevic, which had left the asylum question open, to say that a moderate reading would not require proof that persecution will probably happen, and that “it is enough that persecution is a reasonable possibility.”

The history pointed the same way, in three respects. Before 1980, refugees seeking admission from abroad were measured by a “fear of persecution” test that the Board itself had called substantially broader than withholding. Congress wrote the 1980 definition to match the 1967 United Nations Protocol, whose drafters did not require a showing that persecution was more likely than not. And Congress rejected a Senate bill that would have limited asylum to people who also qualified for withholding.

Why the easier test comes with the better relief

The government’s best argument was structural. Asylum gives more than withholding, including a route to a green card. Why would Congress make the better protection easier to qualify for?

Because the two are different kinds of promise. A person who shows a clear probability is entitled to withholding. A person who shows a well-founded fear is entitled to nothing, and is only eligible for the Attorney General to consider. “We do not consider it at all anomalous,” the Court wrote, that a broad class may be considered for discretionary relief while a narrower class receives mandatory protection. Congress kept control through discretion, not through a higher threshold.

The Court would not defer to the agency

The government’s other argument was deference to the Board’s view that the standards were the same. The Court drew a line. Whether Congress meant the two tests to be identical is “a pure question of statutory construction for the courts to decide.” The Court added that the Board had taken inconsistent positions over the years, which further weakened its claim to deference. What a well-founded fear looks like in a particular case is something else. The term has some ambiguity that can be given concrete meaning only through case-by-case decisions by the agency.

The agency-deference framework the Court used for that second category came from Chevron, which the Supreme Court overruled in Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024). Courts now decide for themselves what a statute means. How the agency applies the standard to the evidence is still reviewed deferentially, as explained below.

So the holding was narrow in form. The Court did not define the test in detail. It held that the immigration judge and the Board were wrong to treat the standards as identical, and it affirmed the Ninth Circuit, which had sent her asylum claim back to the Board. The Court did not decide whether she qualified, and withholding was no longer in her case.

Justice Blackmun, who joined the opinion, added a pointed criticism of what he called the agency’s “seemingly purposeful blindness.” Justice Scalia agreed that the plain text decided the case, and wrote separately to object both to the Court’s long tour through legislative history and to its discussion of how much deference agencies receive.

The dissent: The difference is only words

Justice Powell, joined by Chief Justice Rehnquist and Justice White, said the Court had attacked a position the Board never held. According to him, the Board’s decision in Matter of Acosta had not demanded a 51% showing. It asked for a “realistic likelihood” of persecution and concluded that in practice the two standards converge. The majority answered that Acosta itself recognized a difference, that the Board had been inconsistent for years, and that the Board had treated the standards as the same when it decided this case in 1984, before Acosta. “Governments rarely persecute people by the numbers,” he wrote, and the Court’s hypothetical had little to do with the evidence in real cases. He would also have reversed for a separate reason: As he read the Board’s decision, it had tested her claim under the more generous formulations and found it wanting. Part of his point was concrete: Her parents, two sisters and other relatives had remained in Nicaragua, and she admitted she had never been politically active. The majority declined to reach that argument because it was not raised in the briefs or the question presented.

Ten percent, and what became of it

The Court’s hypothetical has been repeated ever since. The Ninth Circuit has said that “[e]ven a ten percent chance of persecution may establish a well-founded fear.” That line comes from Al-Harbi v. INS, as quoted in the dissent in Flores Molina v. Garland, 37 F.4th 626 (9th Cir. 2022). Judge VanDyke argued there that the figure misreads Cardoza-Fonseca, which he said held only that a “reasonable possibility” is required. The majority focused on Flores Molina’s own experience. It held that the threats and violence Flores Molina suffered were persecution, sent the remaining elements back to the Board, and separately faulted the Board for ignoring strong evidence about future danger. It also rejected the Board’s own arithmetic, calling the share of protesters who had been detained “meaningless” where the applicant himself had been targeted.

The number is a useful way to explain that the test is below 50%, and that a low figure does not by itself defeat a claim. It is not a formula. The test in the current regulation is a “reasonable possibility.” The same regulation presumes a well-founded fear after past persecution unless the government rebuts it. For a claim based on future danger, the question includes whether you could safely and reasonably relocate within your country. Someone who suffered past persecution may also qualify for humanitarian asylum if its severity gives compelling reasons not to return, or if there is a reasonable possibility of other serious harm. What decides these cases is evidence of a real chance of harm to you, either because you would be targeted or because people in your group are persecuted as a pattern and you belong to that group.

Later law limits what a court can do with these findings. A court can overturn a decision that a fear was not well founded only if any reasonable decision-maker would have to conclude otherwise. INS v. Elias-Zacarias set that rule, Congress wrote it into the statute, and in March 2026 a unanimous Supreme Court applied it in Urias-Orellana v. Bondi to the agency’s decision whether undisputed facts amount to persecution. The fear must also be connected to a protected ground. That is why it matters so much that the agency uses the right test at the start.

What this means for your asylum case

These steps are our practical advice, based on these decisions and the current asylum statute and regulations.

• Argue each protection separately. Argue asylum, withholding and, where torture is a risk, protection under the Convention Against Torture. The asylum form generally counts as a withholding request too, but each protection has its own test. Losing one does not decide the others unless the judge’s reasons apply to both.
• Read the decision for the words that give the error away. If the judge used “clear probability,” “more likely than not” or “would be persecuted” as the test for your fear of future persecution on the asylum claim, that may be a legal error to raise on appeal. Check first that the words were not about withholding, torture or another issue, and whether another ground supports the denial.
• Prove both halves of the fear. Your own detailed, believable testimony can be enough, but do not count on it. Gather country reports, news accounts, letters and the experience of people in your position, and be ready to explain why any document you cannot get is unavailable.
• Explain the link to you. Cardoza-Fonseca’s claim ran through her brother. Justice Powell stressed that her parents, two sisters and other relatives were still in Nicaragua and that she had not shown any of them, other than her brother, had been harmed. If relatives in the same position are safe, say why your situation differs.
• Do not stop at eligibility. Asylum is still discretionary. Give the judge the reasons to grant it, including your ties here and anything that bears on your character.
• Watch the other requirements. A one-year filing deadline can stop an asylum claim even when the fear is well founded, unless an exception for changed or extraordinary circumstances applies. Withholding does not have that deadline, but it has the higher standard and some bars of its own.