. >> mark kinsley, a drug researcher at the yale school of public health should know.kinsley was a recovering drug addict until one day in 2005 when his work reconnected him to his past. >> we were working with active drug users that were injecting drugs. and i accidently had gotten stuck with an infected syringe and had to go on medications in case that syringe had been positive. i went into a deep depression and even after 11 years of being clean when i went into that depression, i knew what would relieve my depression and that was a bag of heroin. >> mark kinsley quickly became addicted to the drug he swore he would never use again. >> you know, we were using heroin. early into the evening, i had gone into an overdose as a result of using too much heroin. and he administered the antidote to bring me out of it and did so. i wish that would have stopped me from using. it did not stop me from using at that point. it ultimately allowed me to get to a place where i wanted to stop using and was able to get recovery again. >> proponents of delivering the antidote directly