Land is not an "AS IS" purchase when hazardous waste or a deadly substance or land fill was created.

@Calvin KwonThere's a difference between a cost sharing arrangement and subleasing, and different tax treatments follow.It's unclear from your OP what (1) arrangement you have with the other individual, if any, and (2) the economic reality of the transaction (e.g. what it is in substance).

@Jeff BridgesAh, finally we get the substance and avoid the humiliatingly ignorant chatter of those good people who would love to be able to move bathroom fixtures around arbitrarily in a remodel without being bothered by the pesky reality that, hmm, well, little chocolate children must flow consistently downward in order to leave a bathroom.Can you cross a joist with the 3-inch (that's actually internal diameter, it's 3.5 inches outer diameter for Schedule 40 PVC or ABS) waste pipe of your commode, by drilling a big-a$$ hole through a joist to get it through and weaken it significantly?

"Drug-related criminal activity" means the illegal manufacture, sale, distribution, use, or possession with intent to manufacture, sell, distribute, or use of a controlled Substance (as defined in Sections 1 through 42 of the Controlled Substance Act [30-3 1 -1 NMSA]). 2.

I hope I'm wrong, but is it a sort of gauze-like substance with a cracking residue underneath that's both stapled and glued to the floor?

It often means that a property is uninsurable, or has had a hazardous substance issue (like meth preparation on the premise - this substance's ingredients leave lots of dangerous chemicals behind and are exceedingly expense to remove from a location most often requiring special equipment and haz-mat clothing).

Results came back and there was enough substance to be reported to the city.

Bad enough with things people don't need but if people are in need of some basic life sustaining substance such as food or shelter and the supply is restricted just so some businessman can live in a bigger mansion, you have an extremely evil greed system. 

I figured you said "lighten up" to him smoking inside the apartment as the OP made no mention he cared about what substance (illegal or not) was being smoked.

If your contract says that smoking pot/possessing illegal substances on the premises results in forfeiture of the security deposit, that should also cover you.