Because most MKULTRA records were deliberately destroyed in 1973 by order of then CIA Director Richard Helms, it has been difficult, if not impossible, for investigators to gain a complete understanding of the more than 150 individually funded research sub-projects sponsored by MKULTRA and related CIA programs.
The psychedelic properties of Turbina corymbosa and comparison of the potency of different varieties were studied in the Central Intelligence Agency's MKULTRA Subproject 22 in 1956.