USCIS Policy
March 2025: Preponderance of Evidence in O-1
Real-world insights from recent cases. Learn what worked and how to apply these lessons.
The Legal Standard: Preponderance of Evidence Defined
The evidentiary standard governing O-1 adjudications is preponderance of the evidence — a standard well established in immigration administrative law and codified by reference in the USCIS Policy Manual. The landmark administrative decision Matter of Chawathe, 25 I&N Dec. 369 (AAO 2010), articulated the standard with precision: the petitioner must establish that it is more likely than not that the claimed fact is true. This is a lower standard than clear and convincing evidence and dramatically lower than the beyond-a-reasonable-doubt standard familiar from criminal law. It requires only that the evidence tip the scales past fifty percent in favor of the petitioner's position.
For O-1 practitioners, the practical implication of the Chawathe standard is that a petition does not need to present overwhelming or irrefutable evidence of extraordinary ability — it needs to present evidence that, viewed as a whole, makes it more probable than not that the beneficiary qualifies. This framing shifts the focus from assembling the most impressive possible credential list to assembling a record that is coherent, credible, and sufficient. A petition with four strong criteria satisfied by well-documented evidence is likely to meet the preponderance standard even if it lacks several other criteria entirely.
Chawathe also established that the preponderance standard does not require certainty or even a high degree of probability — it requires only that the probability of the claimed fact exceed fifty percent. This means that uncertainty in the evidence is not fatal to the petition, provided the uncertainty runs in the petitioner's favor at the margin. An expert letter that cannot definitively rank the beneficiary as the best in the field but can establish that the beneficiary is among the most recognized practitioners in a particular segment of the field may be sufficient to tip the balance on a specific criterion.
Common mistake: Practitioners sometimes advise clients that they need a 'bulletproof' record before filing, which causes them to delay filings for months or years in pursuit of credentials that are incrementally stronger but not materially different. The Chawathe standard does not require a bulletproof record; it requires a record that is more likely than not adequate. When the practitioner can identify a clear majority of criteria that are satisfied by credible evidence, the petition is ready to file.
The Kazarian Two-Step and Its Application in March 2025
The Ninth Circuit's decision in Kazarian v. USCIS, 596 F.3d 1115 (9th Cir. 2010), introduced the two-step adjudication framework that USCIS subsequently adopted agency-wide for extraordinary ability cases. Step one requires the adjudicator to determine whether the petitioner has submitted qualifying evidence for at least three of the enumerated regulatory criteria. Step two requires a holistic evaluation of the record to determine whether the totality of the evidence establishes extraordinary ability by the preponderance standard.
The two-step framework has significant practical implications for O-1 petition strategy. At step one, the adjudicator is evaluating whether the submitted evidence falls within the regulatory categories — whether a given award qualifies as a prize for excellence, whether a given publication qualifies as a professional or major trade publication, whether a given salary figure constitutes high remuneration. Evidence that is facially qualifying at step one may be given limited weight at step two if it is from a low-prestige source, covers only a narrow geographic market, or is contradicted by other evidence in the record.
Practitioners preparing for the Kazarian two-step should be explicit in their petition briefs about which criteria they are asserting, what evidence is submitted for each, and why that evidence satisfies the regulatory definition. A petition that presents evidence without organizing it by criterion forces the adjudicator to do this categorization independently, increasing the risk that qualifying evidence will be miscategorized or overlooked. The brief should also address the step-two holistic question directly: why does the totality of this record establish extraordinary ability? The answer to that question should synthesize the criteria evidence into a coherent narrative about the beneficiary's position in the field.
The Kazarian framework has been the subject of litigation and policy debate since its adoption, but as of March 2025 it remains the operative framework for O-1 adjudications. Practitioners should be familiar with circuit-specific Kazarian case law and with the USCIS Policy Manual chapters that implement the framework. Post-Kazarian decisions from the AAO provide the most relevant guidance on how the two-step analysis is applied to specific evidentiary configurations, and practitioners should research recent AAO precedents before building the petition strategy for any significant filing.
Weight of Expert Letters Under the Preponderance Standard
Expert letters are among the most contested evidentiary items in O-1 adjudication, because USCIS officers have broad discretion to evaluate the weight given to expert opinion evidence. Under 8 CFR 214.2(o)(2)(iv)(E), the opinions of recognized experts in the beneficiary's field are explicitly recognized as qualifying evidence, and the regulations contemplate that expert letters will be a core component of the O-1 evidentiary record. But the preponderance standard does not require USCIS to accept expert opinions at face value; it requires that the petitioner demonstrate that the expert's opinion is more probably correct than not, which is a function of the expert's qualifications, their analytical method, and the specificity of their conclusions.
A well-constructed expert letter under the preponderance standard must do three things. First, it must establish the expert's own credentials — their position in the field, their experience evaluating professionals at the level of the beneficiary, and their basis for claiming to know who is extraordinary and who is not. An expert letter from the director of a major research university's computer science department carries more inherent weight than a letter from a graduate student, not because of seniority per se, but because the department director's professional experience provides a broader comparative frame. Second, the letter must provide a specific analytical comparison between the beneficiary and other practitioners in the field. Third, it must offer a reasoned conclusion — not just an assertion — that the beneficiary meets the regulatory standard.
Officers conducting Kazarian step-two analysis routinely discount expert letters that are conclusory, that lack specific field comparisons, or that appear to have been drafted by the beneficiary's counsel rather than reflecting independent expert analysis. Practitioners should share drafts with experts but should not write the letters themselves; the letters should reflect the expert's own knowledge, voice, and analytical framework. An expert who drafts their own letter, even if it is less polished than one drafted by counsel, is generally more persuasive because the analysis reflects genuine subject-matter expertise rather than legal advocacy dressed in expert garb.
Common mistake: Practitioners sometimes obtain expert letters from individuals who are prominent in the beneficiary's professional network — colleagues, mentors, collaborators — rather than from truly independent experts who have no personal stake in the outcome. Officers are aware that beneficiaries cultivate supportive networks, and letters from known associates are given less weight than letters from experts who have no apparent personal relationship with the beneficiary. When possible, at least one or two expert letters should come from practitioners who have not worked with or for the beneficiary, whose opinion therefore reflects independent professional assessment.
RFE Response Strategy Under the Preponderance Framework
A Request for Evidence (RFE) in an O-1 case is not a denial — it is an invitation to supplement the record on specific points where the officer has concluded that the existing evidence does not establish preponderance on one or more criteria. The RFE will typically identify the specific criteria or factual claims at issue and describe what additional evidence would be sufficient to address the deficiency. Practitioners should read RFEs with care and respond precisely to each identified deficiency rather than submitting a broad supplemental package that adds evidence on all criteria indiscriminately.
The most effective RFE responses are organized around the preponderance standard: for each identified deficiency, the response should present new evidence and explain specifically why that evidence, combined with the previously submitted evidence, now tips the balance past fifty percent in the petitioner's favor. This framing is more persuasive than simply adding more evidence without connecting it to the legal standard. An RFE response that says 'We are submitting the following additional evidence' is weaker than one that says 'The following evidence establishes, by a preponderance of the evidence, that the beneficiary satisfies the [criterion] requirement under 8 CFR 214.2(o)(3)(iii)(B)(X) because...'
RFE responses in O-1 cases typically have a ninety-day response window, which is usually sufficient to gather additional evidence but requires prompt action. Practitioners should contact the beneficiary immediately upon receipt of the RFE, identify the strongest available response to each deficiency, and begin document collection without delay. If the RFE identifies a deficiency that genuinely cannot be cured with available evidence — for example, a demand for national press coverage when the beneficiary has only regional coverage — the practitioner must make an honest assessment of whether a strong RFE response is achievable or whether the petition is unlikely to be approvable. Submitting a weak RFE response that results in a denial is worse than withdrawing and refiling after additional credential-building, because a denial creates a negative record that may affect future petitions.
Practitioners should also evaluate whether an RFE reflects a genuine evidentiary gap or a misapplication of the regulatory standard by the officer. Officers sometimes issue RFEs that are inconsistent with applicable regulations, policy guidance, or AAO precedents. In those situations, the response should include a legal argument citing the relevant authorities and explaining why the officer's stated standard is incorrect, in addition to any supplemental factual evidence. Responding only on the merits without correcting a legal error allows the error to propagate if the petition is denied and goes to appeal.
Building a Preponderance Case When Evidence Is Mixed
Many O-1 petitions involve mixed evidentiary records — strong evidence on some criteria, adequate evidence on others, and sparse or absent evidence on the rest. The preponderance standard requires that the totality of the record establish extraordinary ability more probably than not, which means that a mixed record can still be sufficient if the strong criteria are documented comprehensively and the overall narrative is coherent. The key is to present the strongest criteria prominently, explain why they are sufficient to establish preponderance even without all criteria satisfied, and contextualize the weaker or absent criteria without drawing unnecessary attention to them.
Practitioners building a preponderance case with mixed evidence should consider the cumulative weight argument: the combination of multiple adequately satisfied criteria, each of which individually represents field-level recognition, collectively establishes extraordinary ability even if none of the individual credentials is in the top tier. A beneficiary with a national award, two solo exhibitions at recognized galleries, coverage in a professional publication, and expert letters from three independent field experts has built a preponderance case even if their salary is not in the top ten percent or if they have not been a judge of others' work. The practitioner's brief should make the cumulative weight argument explicitly rather than relying on the officer to synthesize it independently.
The preponderance standard also permits the use of circumstantial evidence to support criterion satisfaction when direct evidence is unavailable. A beneficiary who has not received a formally titled prize but who has been invited to exhibit at a juried show — where invitations are made by a committee on the basis of submitted work — has circumstantial evidence of the type of peer recognition that the awards criterion is designed to capture. Expert declarations explaining the significance of juried exhibition invitations as a form of competitive selection can bridge the gap between the literal regulatory language and the evidentiary reality of the beneficiary's field.
Common mistake: Practitioners sometimes over-brief the weak criteria in an attempt to cover all bases, which draws the officer's attention to the weaknesses rather than the strengths. A petition brief that devotes ten pages to explaining why barely-qualifying evidence is sufficient on a marginal criterion signals to the officer that the practitioner knows the criterion is weak. Better practice is to address the marginal criterion efficiently and proportionately, then devote the bulk of the brief to developing the strong criteria where the evidence speaks for itself.
Post-Denial Appeals and the Preponderance Standard at the AAO
When an O-1 petition is denied, the petitioner may file a motion to reopen or reconsider with the adjudicating officer or file an appeal with the Administrative Appeals Office (AAO). The AAO conducts a de novo review of the record, applying the preponderance standard independently of the initial officer's conclusions. An AAO appeal provides the opportunity to correct legal errors in the initial denial, supplement the record with new evidence on motion to reopen, and develop legal arguments that were not fully presented in the original petition.
AAO precedent decisions — those designated as precedent by the Attorney General or the Director of USCIS — are binding on all USCIS officers and provide the authoritative interpretation of regulatory requirements. Practitioners should identify any AAO precedent decisions relevant to the specific criteria at issue in the denial and cite them prominently in the appeal brief. A denial that contradicts AAO precedent is a strong candidate for reversal, particularly if the practitioner can demonstrate with precision that the officer's analysis departs from the binding precedent.
The motion to reopen option allows the petitioner to submit new evidence that was not available at the time of the initial filing. Under the preponderance standard, new evidence does not need to be overwhelming — it needs to be sufficient, when combined with the existing record, to tip the balance past fifty percent. A motion to reopen that submits a single highly credible new expert letter, combined with a compelling legal argument that the existing record was adequate but insufficiently briefed, can be successful even without a dramatic overhaul of the evidentiary record.
Practitioners should be realistic about the value of AAO appeals compared to refiling. An AAO appeal takes twelve to eighteen months to resolve and does not preserve the beneficiary's ability to work during that period unless other status is maintained. Refiling with a materially stronger record, while incurring additional fees, may result in approval within sixty days under premium processing. For beneficiaries with pressing timelines, refiling is often the more practical path, and the denial notice's gap analysis function — identifying precisely what additional evidence is needed — can make the second filing stronger than a first filing that was not informed by an officer's findings.