The last time a cop asked me "Breath, blood, or urine"  I said "No thanks, I'm full"
He wasn't amused......   
He gave me a written warning for having a taillight out.  I was supposed to get the light fixed, have the warning signed by a licensed inspection mechanic and return it to the police station in 7 days.  He then said I could go.  So while he was finishing his paperwork I reached in my glove box, got a spare bulb, replaced the burned out one, signed the warning and gave it back to the cop.  He informed me that I needed to have it signed by a LICENSED inspection mechanic.  So I pulled out my PA State inspection license and showed it to him.
He was even less amused by that.............