Episode summary: There’s one kind of expert whose role is enshrined in law: that of the expert witness, who’s called on to bolster one side of a case. But courtrooms are not great places for nuance. Overconfident expert testimony has been linked to countless wrongful convictions, especially in gang-related cases. Michael speaks with a new kind of expert witness: former gang members who struggle to counteract the testimony of police. If you’d like to keep up with the most recent news from this and other Pushkin podcasts be sure to sign up for our email list at Pushkin.fm. See omnystudio.com/listener for privacy information.