Vino
I remember in GTA IV, if you stole a police car you were able to do basic police work, but you're right, it'd be amazing if R* went really in depth with this concept.
Mook
I actually asked him how he remembered the code names, apparently our "boi ZT" is becoming a cop. That shows just how much effort people put into the mod to use correct police code names.
Unless our "boi ZT" lied to me, in that case, rude af.