the FCC says t0 codes are premissable but i can you that 98% of Generation Z has no idea what the most common 10 code, 10-4 means.. Before i retired, i would always have fun answering simple yes questions emails from these young folks with a simple 10-4.. It amazed me that most these folks would answer back, Ahh?? or what do you mean or what does that mean... But since the FCC says 10-codes are permissible,, 10-Code away and have fun..