-according to the source Demi's friends revived her with Narcan, called the cops, notified members of Lovato's team about the situation, then fled before emergency workers arrived on the scene (sick)
-Demi began using again after firing her sober coach earlier this month,
-A nurse at the hospital told police Demi had been using methamphetamine prior to her alleged overdose.
-Officers on the scene reportedly took photographs of drug paraphernalia they found in the house and remnants of what looked to be illegal drugs in the home but do not plan to press any charges since they were responding to a medical call and not a criminal report.
more at the SOURCE