Not necessarily....supposedly he works in a hospital. Yeah, frightening I know.
That might give him easier access, but it depends on what he did in the hospital-and still, you can't get drugs for no reason. Everything is supposed to be signed for . I heard he claimed he wanted to be nurse, but never actually became one. He wouldn't have direct access to drugs, in that case, but , if he was working at a hospital , it would be worth a check to see if any Insulin came up missing/un-accounted for from the Pharmacy or from any patients.
Also, I'm not entirely up on my pharmacology- but Insulin might be related to Terri's initial "mysterious" collapse? Maybe check her labs exc...(I'm thinking this, since some have claimed he tried to inject her with it on more than one occassion-maybe that was his original plan?) Also, the hospital may not have checked for an Insulin overdose, since she wasn't diabetic as far as we know.
Like I said, she needs a real good detective to look into these things.
Pray for Terri