Ottawa Police say one of two young women who suffered extreme averse reactions to street drugs last week took MDMA - or ecstasy - and took it willingly.
The toxicology test was for a 20-year-old woman from Ottawa recovering in hospital.
Investigators are still waiting for results of the second test on the 19-year-old who died.
Those aren't expected for another 3 to 6 months.
Police say no foul play is suspected in the case.