Sucks, took me a long time to listen to my dad and learn that folks with character flaws will inflict those flaws on anyone. Thieves steal, it's what they do. Even if they feel horrible about it afterwards, they might stop being theives, but it's not terribly likely.
My old best friend growing up was a thief, but I thought he wouldn't screw me over, that we we're too tight, and hell we shared most of everything as it was. Nope, took me from $15K up to $4K in the hole in less than a month, leading my family to disown me for a few years once he found my banking information and raided my wallet while I was sleeping.
His life sucks more now, mine sucks less, but it doesn't feel very satisfying. Last I checked he's still a dick, and went nazi in the joint (I did not send him there, his aunt did)...I don't check much anymore.
If you need to do something to protect your reputation and house, go for it, but the drugs are gone, and the guy should be forgotten about.