Get a receipt. If it's a shakedown they won't give you a receipt.
Suggest that we all go to the police station to pay the fine in front of a supervisor. If you do that, then the ossifer doesn't get any of the money and it goes directly into the town coffers.
Write down the cop's name (in most places they have name tags).
IBA #7552 - SS1K in 2000 and 50CC in 2002
In the Uvalde, TX area and always willing to help travelers escaping into Mexico.