It's not locked away with the likes of Oramorph that needs singing out and is checked daily, so will of been stored in a bog standard medicine cupboard so is easily accessible. Only documented on a paitens kardex upon administering (if obviously prescribed and indicated)Using insulin is a common way that medical professionals have murdered. I’ve never worked in a medical setting but don’t you have to document any medicine or any medical equipment that is taken from storage, could that be a way they pinpointed her?