. >> the difference between me and kevorkian, well, he liked the publicity. ours is a private thing. >> reporter: this doctor used to be the medical director of the final exit network. he keeps an office in this small home in baltimore, maryland. >> reporter: you make the patient plug it in, pull the bag nozzle. >> yeah, all of those things. >> reporter: so you are not physically doing anything? >> i physically do nothing. and each of those go to a tank. >> reporter: he showed us what he uses to help people die. modified turkey cooking bags filled with tubes that hook up to helium tanks. >> i asked a patient one time, i said would she mind -- be willing that some other person use is this? >> reporter: he has used an exit hood like this one to help many people end their lives. >> and she thought it was a marvellous idea. the fact that she would be giving a gift to somebody else. and i have done that. >> reporter: recycled them? >> recycled led them. reused them. >> reporter: has this one been used? >> yeah. >> reporter: oh. what is that process like? >> the pe