While we're on hiatus, we're replaying some of our most popular tracks to help people meet this moment of renewed interest in changing the criminal legal system. The use of big data in the criminal legal system raises some thorny legal, cultural, and ethical questions. What level of surveillance are we willing to tolerate? Is data actually objective? What will happen to legal standards like reasonable suspicion as our information changes? These are questions we need to ask and answer soon, because big data is already infiltrating law enforcement and the criminal legal system more broadly.