A friend and his wife _almost_ fell victim to this last year, in Texas.

I think it is a standard script now. Call comes from police department. 'Your son hit a pregnant woman. He is about to be booked. You need to pay $$$$ yada yada'. With an authentic sounding voice conversation from their son.

In spite of several red flags (in hindsight) they withdrew $15K from bank, and somehow at the last minute pulled back.

Edit: Scammers know how to push the right buttons.