Cigarette Butts on the Roof

Just recently we had some parts of the roof repaired at the apartment. Imagine my dismay when I learned from Dods, my handyman, that one of the units had cigarette butts on the roof of the toilet. The toilet is on the first floor and my hunch is that the butts were thrown from the unit's second floor bedroom window and landed on the toilet's roof. Well it's either that or the butts have been tossed upwards from the laundry area onto the roof - which is rather unlikely.

This angered me and told the occupant about it. Only the dad was there visiting and apparently he didn't know about the smoking that was going on! He promised to relay the info. I later texted the mother about the problem just to reiterate.

This problem has a couple of serious issues:

1. Fire hazard. Smoking in the bedroom should be a definite no-no. Not a few fires started from a sleepy smoker forgetting a lighted cigarette.
   
2. Drainage problem. When butts get down the storm drain, you could imagine the potential clogging.

If I still catch this habit, I'll give them the final warning. And then off they go, if I catch them the third time. That's a lot of leeway, in my opinion.