A few years ago my nephew graduated from college. He had a pony tail and a beard. He was also 100% clean. He hates drugs with a passion and doesn't even smoke or chew. He was driving home through TX, carefully watching the speed limit, when a state cop pulled him over. He has the sense to not get bitchy with cops. It's yes, sir and no, sir. The cop apparently associated long hair with drugs because he searched the car, found nothing, then called in a K9 unit. The dogs didn't find anything either. They detained him about 4 hrs before it was over. It was pretty much a clear cut case of discrimination against long hair.
