FILE - In this Friday, March 22, 2019 file photo, a participant takes a very smoky puff from a marijuana cigarette during at meet and greet at "Tommy Chong's Live, Love, and Smoke Tour hosted by GreenTours in the Woodland Hills section of Los Angeles. Los Angeles prosecutors are joining other California district attorneys to tap technology that could wipe out or reduce more than 50,000 old marijuana convictions. District Attorney Jackie Lacey announced Monday, April 1, 2019, that she is joining forces with a nonprofit organization that uses computer algorithms to identify eligible cases. San Francisco became the first city in the state to work with Code for America to expunge or reduce 8,000 convictions. (AP Photo/Richard Vogel, File)