Drones will use Microsoft Active Directory. They will be placed into a group policy with only law enforcements local policy to override it.
Maybe drones will be fitted for reading DNA and tracking based on it. A sweat module on the skin gets picked up, matched against an uploaded DNA database and BOOM! Shouldnt have eaten the kung po chicken.
Facial recognition and iris-scanning systems would allow the robot to look at each human it meets and check if it's on a list of "wanted" people. Anybody wearing a hoodie, reflective sunglasses, or other article which would hamper the identifier-system's operation could be detained until the robot IS able to identify the person.