Dermatologist BERNARD ACKERMAN, Professor of Dermatology and Path Director of the Institute for Dermatophathology at Jefferson College. He participated in the testing done at Holmsburg Prison. Dermatologist RICHARD TANNEN and current Vice Dean for Research and Research Training at the University of Pennsylvania Health System discusses their current research and testing guidelines. 12:58:30 NEXT SHOW PROMO (:29) PROMO COPY On the next Fresh Air.... the use of prisoners as guinea pigs. . . a talk with ALLEN HORNBLUM about the experiments conducted on inmates at Philadelphia's Holmsburg prison in the 1950s, 60s and early 70s. His new book is "Acres of Skin." The practice was outlawed in the 1970s, but not before hundreds of men were used to test everything from facial creams to chemical warfare agents. Also a talk with a former inmate who participated in the experiments who then led the fight against them, and a talk with a doctor who carried out the testing. And a discussion about current research and testing guidelines with a representative from the University of Pennsylvania. That's all coming up on the next Fresh Air.