Jon Bon Jovi's daughter will not face criminal prosecution after allegedly overdosing on heroin in a college dorm yesterday -- because the D.A. has dropped all charges.

A rep for the Oneida County District Attorney's Office says it is dismissing all criminal charges against Jon's 19-year-old daughter Stephanie Bongiovi as well as the 21-year-old male student allegedly involved with Stephanie's overdose.

TMZ broke the story ... Stephanie was arrested after being treated by emergency medical personnel following the alleged overdose at a Hamilton College dormitory. Cops claim a drug task force found small quantities of heroin in the dorm room ... along with marijuana and drug paraphernalia.

Stephanie was arrested for possession of a controlled substance, possession of marijuana and criminally using drug paraphernalia. The 21-year-old was also charged with drug possession.

The D.A. says the charges were dropped because of a New York law that specifically prohibits prosecution of people experiencing a drug overdose -- as well as the people who help them seek medical care.

Read more: http://www.tmz.com#ixzz2CLd9KtLv