The record
A peer-reviewed analysis (PMID 31469695), citing a 2017 APHA conference abstract, reports that 686 of 1,032 talc tests conducted between 1948 and 2017 detected asbestos.
Claim scope
That a large body of historical talc testing — 686 of 1,032 tests over seven decades — reported asbestos detections, per a peer-reviewed secondary compilation.
What this source does not establish
The figure is 686 of 1,032 TESTS, not products — never render it as '66% of products.' The underlying test set was selected through litigation discovery, and the author's litigation role is disclosed; the population of all talc tests ever conducted is unknown.
Limitations
Always pair the figure with the test-vs-product distinction and the discovery-selection caveat.
Source
Pmid — 31469695