Paintballing outfits, rafting companies, outward-bound, etc. should be advised to welcome these folks warmly like unsuspecting redneck yokels, take lots of group photos (to be mailed back to them), receive and then discard refreshing cans of soda via ungloved hands (to be collected and bagged), and make sure they pay via credit-card.
And then their staff should jot down their plates and CALL THE FREAKING FBI.