A blonde woman is speeding down the road in her little red sports car and is pulled over by a woman police officer who is also a blonde.
The blonde cop asks to see the blonde driver's license. She digs into her purse and is getting progressively more agitated.

"What does it look like?" She finally asks. The policewoman replies, "It's square and it has your picture on it." The driver finally finds a square mirror in her purse, looked at it and handed it to the policewoman.
"Here it is," she said. The blonde officer looked at the mirror, then handed it back saying,

"Okay, you can go, I didn't realize you were a cop."