DEMI LOVATO Refuse to divulge drug overdose, no criminal investigation

Demi Lovato refused to tell paramedics what drug caused her to overdose , and law enforcement sources say no drugs were seized at her home .
Law enforcement sources say Lovato was not cooperative when EMTs worked on her at her home Tuesday morning. Those sources believed it was a heroin OD based on what they observed at her home , but a source close to Lovato tells us it was not heroin , though the source refused to divulge what caused the OD.

As we first reported , Demi was unconscious when paramedics arrived and she was brought back to consciousness with Narcan , which is used to counter the effects of opioids .

Our law enforcement sources say there is NO criminal investigation , because they did not seize any drugs and can' t determine if Demi was in possession of an illegal substance .

Demi is recovering in the hospital.