I used to have a Sikh manager who wore a turban. Whenever we traveled together, he would get "randomly" stopped. While they were patting him down, he would inevitably chuckle and say something like "So what are the odds of being 'randomly' selected 27 times in a row?"
I don't know the specifics of the process for selection, but I can confidently say that the process is bigoted.
In proper English usage it would only be a bigoted
(obstinately or unreasonably attached to a belief, opinion, or faction, in particular prejudiced against or antagonistic towards a person or people on the basis of their membership of a particular group)
check if it was unreasonable to suspect a Sikh of carrying a Kirpan.The Rehat Maryada would suggest that is in no way whatsoever an unreasonable suspicion.
Sure, your manager likely didn't carry one on airplanes .. but that still falls short of being an unreasonable check.
Same thing used to happen to me when I had dreadlocks. Made the same joke too. "what are the odds I'd get randomly selected 100% of the time I go through a checkpoint..."