Here are the two reasons I do not believe SK was invloved in drugs :
1. He was almost destitute. Had barely enough money for food. Sleeping in his car. People involved in the drug scene live high on the hog. Only time they get raggedy is if they are using their drug profits to buy drugs for themselves. And that is easy to spot.
2. His character as I know it. I do not know SK, but here is something I noticed : when the other guy who lived in the house took his food, what did Steven do ? He went to the landlady, and reported it. Did he punch the other roomer in the face ? No. Threaten him ? Not that we know of. Very telling ; He was into doing the right thing, the straight arrow thing. IMHO.
I never connected SK's religion with "straight arrowness " ( is there such a word ?).
1. WHAT IF Steven was only involved in drugs for a few days, when he did a favor (maybe unknowingly) for someone? I think someone who's near-destitute is most likely to get involved with something like that....and based upon the drug arrests in my area, it's a myth that people involved in drugs are all living high on the hog. Maybe the kingpins, but not the mules and workers.
2. I'd think the straight-arrow thing to do, would be to man up and confront the roomie to his face: "Quit. Taking. My. Food." Complaining to the landlord about it is, IMO, a bit childish. ...and would only anger the roomie. "You got me in trouble!" says the roomie!