Tell the dolts to do a few direct smears, see if the snake has any protozoans making him have diarrhea. If he ever came in contact with dirty water sources, he may have giardia, or who know what else.

Don't let them do a float, DO A SMEAR. Get the fecal sample to the vet within a few hours, don't refrigerate for too long if you can help it as it will kill off the baddies that need to be seen.