Possible prescription drug abuse

This is interesting. According to my oldest and middle sons, the x and his fiancee are taking some 'questionable' prescription drugs. The fiancee's father is a pharmacist who owns his own drugstore.

The fiancee keeps a large container in their bedroom full of a hodge-podge of various drugs. My oldest son snuck into their room one day and brought some samples down here to my house to look and see what they were taking. The oldest and my middle son have shared stories of the x and the fiancee appearing to be in a drugged state.

Lethargic. Sleepy. Mumbling incoherently. Short-term memory loss. The x used to not be like that. My oldest and middle son think he's taking something.