Blonde on blonde

A blonde woman was speeding down the road in her little red sports carand was pulled over by a woman police officer, who was also a blonde.The cop asked to see the blonde's driver's license. She dug through herpurse and was getting progressively more agitated."What does it look like?" she finally asked.The policewoman replied, "It's square and it has your picture on it."The driver finally found a square mirror, looked at it and handed it tothe 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."