IF it was methadone, I would think the cops would confiscate it and there should be a label. I'm pretty sure that the cops were with him. (Maybe not)(Maybe a dick)
Anna's Death Fridge -- Methadone and Slim-Fast
http://www.tmz.com/2007/02/11/annas-fridge-after-death-methadone-and-slim-fast/
The pics below it definitely looks like a small bar fridge.
It looked like one of those hotel room refrigerators to me.