Theoretically, you can still bring them home, but if you follow a few basic cleanliness procedures it's seldom an issue. At least a couple time a month I see someone bring in a snake with mites, or help someone treat them, and I have never *knock on wood* brought them home to my snakes.
I personally feel an ounce of prevention is worth a pound of cure; just pick up a bottle of provent a mite, and about twice a year, treat your bedding.
Also, here's a link to an article written by one of our most experienced staff members on how to kill mites. As much as they suck, they are not the end of the world, and these are the instructions I've been giving to customers for years with a lot of success.
Take or leave it, but this is the technique I've seen the most people have the most success with.
http://lllreptile.com/info/library/c...h-snake-mites/
-Jen