Might have been Ewan Cameron, a Canadian researcher on contract. Anyway one “experiment” at Kentucky State Prison involved addicts who were given a choice of their favorite drug as a reward, under the condition they agree to take part in their experiments. They kept 3 inmates on LSD for 77 straight days, and when they tried to go to sleep (eventually) they were awakened with cattle prods. Cameron called it “psychic driving”, or somesuch.
They seem to have often chosen people vulnerable or otherwise lacking full agency in some way.