The record
Strobel's expert relied on a 1972 FDA-sponsored Lewin study of 195 commercial cosmetic talc products and on a 1976 article by A.N. Rohl and A.M. Langer testing 20 consumer talc products.
Claim scope
A published opinion identifying the two foundational measurement studies by author and year — and critically, the Rohl & Langer 1976 article is PubMed-indexed, which converts it from trial-exhibit material into a directly citable Tier-1-eligible primary source (see the PMID 1011287 record).
What this source does not establish
The opinion's date for the Lewin study (1972) conflicts with McNeal's placement of the 195-sample figure in the July 1973 FDA memorandum. Do not assert a single year. Does not itself establish the 10-of-20 detection count — see PMID 1011287 for that figure.
Limitations
This record's value is as a bridge: it points from the litigation record to a peer-reviewed publication that can be cited directly.
Source
Case Citation — Strobel v. Johnson & Johnson, 70 Cal.App.5th 796 (Cal. Ct. App. 1st Dist. Div. 4, 2021)