Newly minted Philadelphia District Attorney Larry Krasner was elected on a platform of bringing criminal justice reform to the office and attacking mass incarceration. Now Krasner, a former civil rights attorney, seems to be making good on his promise. On Tuesday, he issued a remarkable memo to his assistant DAs that swaps the office’s traditional tough-on-crime approach in favor of one intended both to reduce the number of people in city jail and prisons, and to shorten the duration of their stays. “If the goal is reducing mass incarceration, that strikes me as an incredibly significant measure.” The memo instructs prosecutors to cease charging certain offenses entirely—including possession of marijuana, regardless of the weight carried, and prostitution in some circumstances.