My vet concurrs with the just had a drink theory! As for parasites, I feed only frozen rodents, and they have both been treated, so we should be OK in that department.
He seems to be normal so far, but I'll keep an eye on him for a while.
:According to the book I referenced before, even mice can be a significant source of parasites. He also says that freezing for 30 days should eliminate most problems. So basically, if you are feeding your snakes anything but frozen foods, you can easily assume there is risk of endo and ecto parasite infestation. If the stool is normal the snake might be fine. Let us know what the Dr says.