When a woman picks up the phone and says are you law enforcement what shall I take on this?
She thinks that if she asks and you tell her no that she is cleared from your being in law enforcement.
It's an old myth. It doesn't mean anything. Some girls just feel safer asking.
I ask sometimes for fun. Helps to read a person sometimes. Some guys disappear after I ask and that's fine with me. I'm not a fan of overly nervous people.... It's kinda stressful. If it's an easy going guy he will laugh and say Hell no!