Susannah Cahalan's 2019 archival investigation (The Great Pretender) could confirm only two of the eight claimed pseudopatients, Rosenhan himself and one graduate student whose own account allegedly conflicts with the published article, and found other inconsistencies and apparently fabricated quotations in Rosenhan's papers.
What would resolve this Identification and independent corroboration (hospital admission records, first-person testimony) of the six remaining pseudopatients Rosenhan claimed but never named.
OpenHistory of PsychologyWikipedia: Rosenhan Experiment