Ah for the good old days when Detroit Police actually published instructions on how to listen in to their brand new radio system....
Short story
Bank robbery
Michigan State Police radio was not yet licensed. (FCC refused to license)
Stuff left out
Troopers were dispatched to blockade points the old fashion way (not by radio)
"Dispatcher" Got on the radio and "Disptached" troopers to primary blockade positions (NO troopers went to those since they got their orders differently)
Robbers heard the radio transmission so took a secondary route.. Which took them .... straight to the pokey with Smokey cause that was where the troopers were.
License arrived 2 days later by express mail.