This is necessary not just because of criminals who want him dead but because of the police too as he works outside the law. Friend to Quinn, the bulky lieutenant, Captain McGrath (under Commissioner Warner) who is so honest he would turn in his own mother if she did something wrong is also enemy of the Black Bat. He suspects they are one and the same (same build, similar voice) and often tries to prove it, with tricks, even once having a doctor examine Quinn's eyes.