Whether a vocational expert's refusal to provide requested private labor-market data categorically prevents her testimony about available jobs from constituting substantial evidence under 42 U.S.C. §405(g).
Holding
No. A vocational expert's refusal to provide requested supporting data does not categorically bar her testimony from constituting substantial evidence; the inquiry is case-specific.
Reasoning
Under §405(g), agency factfinding is conclusive when supported by substantial evidence. That standard is deferential: it requires more than a mere scintilla, but only such relevant evidence as a reasonable mind could accept as adequate to support a conclusion. Social Security disability hearings are also intended to be informal and are not governed by the strict courtroom rules of evidence.
The Court began from a point Biestek accepted: vocational-expert testimony may sometimes qualify as substantial evidence even when the expert does not produce the underlying data. A qualified and experienced expert who explains reliable sources and methods, answers questions thoroughly, and gives testimony consistent with the rest of the record may provide adequate evidence even without submitting her surveys or other supporting materials.
Adding a request for the data and a refusal to provide it does not necessarily make otherwise reliable testimony inadequate. A refusal may create a reason to doubt the expert, particularly if the expert's testimony is weak, unsupported, contradicted, or accompanied by no persuasive reason for withholding the materials. But an adverse inference is not mandatory in every case; an ALJ may find that a credible expert had a legitimate privacy or practical reason not to disclose the data.
The refusal also does not invariably eliminate meaningful cross-examination. Even without the underlying documents, a claimant may question the expert about her qualifications, sources, methodology, assumptions, and the way she derived her estimates. Limits on cross-examination can matter in assessing reliability, but they do not compel a universal rule that the testimony is legally insufficient.
The substantial-evidence inquiry therefore depends on the full administrative record, including the expert's credentials, explanation, methodology, responsiveness to questioning, reasons for withholding information, and any conflicting evidence. Reviewing courts must also respect the ALJ's position as the decisionmaker who observed the hearing firsthand. The Court did not decide whether the evidence in Biestek's particular record was sufficient under that case-by-case standard, because his petition sought only the categorical rule that the Court rejected.