Not that most of us would know what a real Sheriff's uniform looks like, but beware:

http://latimesblogs.latimes.com/lanow/2012/02/deputy-impostor-on-mo...

"On Tuesday, a motorist was pulled over by what appeared to be an L.A. County sheriff's deputy on a motorcycle in Lawndale. He had flashing red-and-blue lights and wore a tan shirt and green pants.

But it turns out the deputy wasn't the real deal, and now authorities are looking for someone impersonating an officer.

The man, described as a white man between 35 and 40, pulled over a motorist near the intersection of 147th Street and Inglewood Avenue.

Although he had most of his uniform together, the badge didn't look right to the motorist."