<human>: Can you give me the gist of the text in a nutshell?

This guy who I've known since freshman year in high school (we're now four years out of HS) has been staying on our couch because he had no where to go.  He now has his own place but because he was a friend he came over to watch some football while both my room mates were home for the weekend. I left the house to run to the convenience store.  I was gone for maybe 20 minutes. Everything seems all fine and well until my room mate gets home and realizes his pills (that he's prescribed to) were missing.  Turns out the couch guy has the same kind of pills on him but refuses to admit to anything and gives a sob story about how he would never bite the hand that fed him. At the time I honestly believed he wouldn't do that and that it was a crazy coincidence. After soberly thinking it over this morning I realized he got away with my room mates medicine.

I have a whole lot of probable cause but there still is reasonable doubt so I'm not sure what to do.  He's one of those guys that will deny until he dies. What would you do if you were in my situation?
<bot>: Good friend from high school stole my room mate's prescribed pills after we had given him a roof over his head when he was homeless.