"Curious about how this "risk-based system" works."
Crap in the middle of the street, shoot up in front of a bus load of kintergarten students, assault and rob a nun? You're gold. Go forth on the promise you won't be a naughty boy again. In fact, we won't even bother picking you up for that.
Commit a rape, a murder, etc.? Well, you're still golden, but we might hold you for a few days. But, no matter how long we hold you, we still won't give you up to ICE, those fascist, Commie goat goat ropers...