In this Oct. 10, 2013 photo, an epinephrine auto-injector is shown that Tyler Edwards, 12, of Hendersonville, Tenn., carries with him because of his allergies. Only 27 states require or allow epinephrine, a drug used to treat anaphylactic shock, to be available in schools. (AP Photo/Mark Zaleski)NASHVILLE, Tenn. (AP) — When a third-grade pupil who had been stung via a wasp developed welts on his neck and had trouble respiratory, college nurse Amanda Williams had the necessary dose of epinephrine to counter the hypersensitivity.