The case addressed the issue of whether a vocational expert's refusal to provide private market-survey data during a Social Security disability benefits hearing categorically precludes the expert's testimony from constituting "substantial evidence" in federal court.

The Supreme Court held that such a refusal does not categorically preclude the expert's testimony from being considered substantial evidence, as "substantial evidence" only requires more than "a mere scintilla."

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The case involved Michael Biestek, a former construction worker who applied for disability benefits due to a degenerative disc disease, Hepatitis C, and depression.

During the administrative hearing, the vocational expert refused Biestek's request to provide the underlying data supporting the expert's opinion on the number of jobs Biestek could perform.

The Court reasoned that if a vocational expert's refusal to provide data automatically disqualified their testimony as substantial evidence, it would lead to an illogical result.

The Court emphasized that the "substantial evidence" standard is a "deferential standard" that does not require the reviewing court to re-weigh the evidence.

The Court's decision preserved the flexibility of vocational experts to rely on a variety of data sources, including their own surveys and experience, in forming their opinions.

The case highlights the tension between an applicant's desire for transparency and the need for the Social Security Administration to rely on expert testimony in disability determinations.

The Court's ruling affirmed the long-standing principle that vocational experts' testimony can constitute substantial evidence, even if the underlying data is not fully disclosed.

The decision reinforced the broad discretion given to administrative law judges in evaluating the credibility and weight of vocational expert testimony.

The case demonstrates the important role that vocational experts play in the Social Security disability benefits process, as their testimony is often crucial in determining an applicant's ability to work.

The Court's ruling in Biestek v.

Berryhill has implications for future Social Security disability cases where the disclosure of an expert's data sources is at issue.