Your petition is not judged beyond reasonable doubt. USCIS applies the preponderance standard, which asks whether your claim is probably true, and says in terms that some doubt does not defeat it.
- Preponderance of the evidence, in most immigration adjudications
- Probably true, or more likely than not
- Some doubt is survivable
- The burden never shifts away from you
- Higher standards apply only where the law specifies them
Burden and standard are different things
Worth separating, because they get conflated:
"The burden of proof to establish eligibility for an immigration benefit always falls solely on the benefit requestor. The burden of proof never shifts to USCIS." USCIS Policy Manual, Volume 1, Part E, Chapter 4
That is who has to prove it. The standard is how much:
"The standard of proof is different than the burden of proof. The standard of proof is the amount of evidence needed to establish eligibility for the benefit sought." USCIS Policy Manual, Volume 1, Part E, Chapter 4
So an officer is never obliged to build your case, and silence in the record is not neutral. It is a failure to meet a burden that was always yours.
What preponderance actually asks
The operative passage, and the reassuring one:
"The standard of proof applied in most administrative immigration proceedings is the preponderance of the evidence standard. Therefore, even if there is some doubt, if the benefit requestor submits relevant, probative, and credible evidence that leads an officer to believe that the claim is 'probably true' or 'more likely than not,' then the benefit requestor has satisfied the standard of proof." USCIS Policy Manual, Volume 1, Part E, Chapter 4
Three adjectives are doing work there. Evidence must be relevant to the thing being decided, probative in that it actually tends to prove it, and credible.
And the consequence of falling short is not automatically denial: "If the requestor has not met this standard, it is appropriate for the officer to either request additional evidence or issue a notice of intent to deny, or deny the case." Which is why responding to an RFE is a live stage rather than a formality.
Where it applies in an EB-1A case
At both steps, which is easy to miss. USCIS instructs officers to determine "by a preponderance of the evidence, which evidence submitted by the petitioner objectively meets the parameters of the regulatory description", and then applies the same standard to the final merits determination.
So neither step demands certainty. The second step asks whether it is more likely than not that you are among the small percentage at the very top of your field, which is a demanding question judged by a moderate standard. The final merits determination covers what that stage weighs.
What this changes about how you build
Perfect is not the target; persuasive is. A gap in one criterion does not sink a petition if the record as a whole makes the claim more likely than not.
Unsupported assertion is not evidence. Probative means it tends to prove the point. A letter asserting that your work is significant is weaker on that test than a citation record or documented adoption, which is why USCIS says witness statements "should be corroborated by documentary evidence in the record". See EB-1A recommendation letters.
Credibility is a real dimension. Overstated claims damage more than the specific point they overstate. This is a practical argument for describing your record accurately, and against the inflated packaging sold by the operators covered in profile-building scams.
Comparison beats adjectives. Because the officer is weighing probability, evidence that positions you against your field does more than evidence that simply describes you.
- For each claim, name the document that makes it more likely than not
- Ask whether the evidence is probative, not just impressive
- Supply the comparison where the criterion is comparative
- Remove anything you cannot stand behind, since credibility is assessed across the whole file
- Expect an RFE rather than a denial where a point is short, and prepare accordingly
Where higher standards apply
Not everywhere:
"The preponderance of the evidence standard of proof does not apply to those applications and petitions where a different standard is specified by law. The Immigration and Nationality Act (INA) provides for a higher standard in some cases, such as the clear and convincing evidence standard that is required when a beneficiary enters into a marriage while in exclusion, deportation, or removal proceedings" USCIS Policy Manual, Volume 1, Part E, Chapter 4
Those situations are outside the employment-based classifications this site covers. If one applies to you, it is a matter for your attorney.
Sources
All accessed 25 August 2026.
- USCIS Policy Manual, Volume 1, Part E, Chapter 4. Burden and standards of proof, source of every quotation above.
- USCIS Policy Manual, Volume 6, Part F, Chapter 2. Application of the standard at both steps of the extraordinary ability review.
- 8 CFR 103.2(b)(8), eCFR. What an officer may do where the standard is not met.
- 8 CFR 204.5(h), eCFR. The EB-1A criteria the standard is applied to.
This article describes the standard in general terms. It is not a substitute for advice from your attorney about your own case.
Frequently asked questions
What standard does USCIS apply to an I-140?
Preponderance of the evidence. USCIS states this is the standard applied in most administrative immigration proceedings, and applies it at both steps of the extraordinary ability review.
Does some doubt mean denial?
No. USCIS states that even if there is some doubt, if the requestor submits relevant, probative, and credible evidence leading an officer to believe the claim is probably true or more likely than not, the standard is satisfied.
Does the burden of proof ever shift to USCIS?
No. The guidance states the burden of proof to establish eligibility always falls solely on the benefit requestor and never shifts to USCIS.
What is the difference between burden and standard of proof?
The burden is who must prove eligibility. The standard is how much evidence is needed. USCIS describes the standard as the amount of evidence needed to establish eligibility for the benefit sought.
Are there higher standards in some cases?
Yes. USCIS notes the INA provides a higher clear and convincing evidence standard in some situations, such as a marriage entered into during exclusion, deportation, or removal proceedings.
Green Card Guide AI is not a law firm and this article is not legal advice. It describes evidence-building strategy in general terms; your attorney determines what belongs in your petition and how it's argued.