Following the June 1945 Fedden Mission investigation of the Dora conditions, Möser was among 19 defendants tried by the American General Military Government Court in the Dora Trial (The United States of America versus Arthur Kurt Andrae et al., Case Number 000-50-37), part of the Dachau Trials. Proceedings began on July 7, 1947 and lasted until December 30. Möser was found to have been present at hangings and personally shooting prisoners execution-style during escape attempts.