Wilma
I think there will be an investigation and Wilma stands the most to lose. She had access to a controlled drug (I mean, each pill HAS to be accounted for), so SOMEONE on down the line was subverting the legal process. If she manages to go scott free, and there is NO investigation, then someone who's politically motivatd is paying to keep the cops from busting her.
I'll bet some doctor's, pharmacist's or hospital administrator's job is in peril right now.