Who is a Cop. In my inbox this evening

When a Michigan farmer was pulled over by a state trooper for speeding, the trooper proceeded to lecture him at great length, throwing his weight around and generally making the farmer quite uncomfortable.
Finally, the trooper got around to writing out the ticket, and as he was doing so, he had to keep swatting away at some flies that were buzzing around his head.
"Having some trouble with those circle flies, are ya?" asked the farmer.
The trooper stopped writing for a moment. "Well yeah," he said, "if that's what they are. I've never heard of circle flies."
"Well, circle flies are common on farms," replied the farmer. "You see, they're called circle flies because they're almost always found circling around the back end of a horse."
"Oh," said the trooper. Then he went back to writing the ticket. After a few moments, he paused and said, "Hey, wait a minute. Are you calling me a horse's ass?"
"Oh, no, no," replied the farmer. "I have too much respect for the law and police officers to even think about calling you that."
"Good" said the trooper, as he went back to writing the ticket.
After a long pause, the farmer said, "Hard to fool them flies, though."