Don't Tread On Ball, Louisiana?

A friend recently gave me a Gadsden Flag sticker for my car, but I try to limit stickers on the back to a discreet few. But if this story is accurate - and considering the source I'm not completely sold that it is - the sticker is going on:

A Louisiana driver was stopped and detained for having a "Don't Tread on Me" bumper sticker on his vehicle and warned by a police officer about the "subversive" message it sent, according to the driver's relative.