Magnotta allegedly killed and dismembered a 33-year old Chinese student, Lin Jun, in May 2012, and has been charged with first-degree murder and causing an indignity to a body.
During preliminary hearings, prosecutors discovered that Magnotta, a male prostitute, participated in a 2007 University of Ottawa study on male and female escorts, The (Montreal) Gazette said.
Magnotta was assured of anonymity and confidentiality, and was then interviewed for two hours, the Gazette reported.
Prosecutor Alexandre Boucher suggested Wednesday that Superior Court Justice Sophie Bourque listen to the audio recording and then decide whether the evidence outweighs the interest of confidentiality.
"Magnotta spoke about his life and work as a male prostitute, so maybe he revealed some personal problems, maybe he talked about his view about sex, violence, unorthodox sexual practices, maybe he talked about his mental condition, his view about crimes, I don't know," Boucher said.
But the lawyer representing University of Ottawa criminologists Christine Bruckert and Colette Parent, who helped administer the study, said Wednesday that Magnotta's privacy should be protected.