I just found a 2018 case out of Illinois where a court agreed that it was reasonable to pull someone over because the cop thought there was something unlawfully obstructing the driver’s view, which turned out to be a rosary hanging from the mirror. The case said that the rosary was not sufficient probable cause to search the vehicle, however. I would be surprised if any court would accept simply wearing rosaries as reasonable suspicion that a crime was committed. I suppose it could be different at a border crossing, but we don’t actually stop anyone from crossing the border these days.