They will ask if he has anything sharp on him then pat him down prior to Police car to station. If dressed out and housed, he will get the full search. Bend over, etc.
If he does not give address and an Adult there, the kid will got to CPS. All because he wants to be a street lawyer. “I don’t have to” like the board experts chirp.
Now he better have his paperwork in order to drive. If he works? they can find out when. They know the route. Do the math. Is it worth it to be a tough guy refusal? Not usually. Guess it depends on the severity of the arrest warrants he is under?