One peculiarity of hazard and liability insurance is a NOO property cannot be vacant for over 60 days, and when an SFR tenant moves, I got to have someone else in within 60 days.

Are they dealing marijuana out of the apartment?

From your post and the info you provided, I'd doubt this was the case - but it's also peculiar to try to 'get in the head' of whoever built the thing with that low of ceilings and door openings!

I thought it was peculiar because I know my area very well and I did not see this on loop net or MLS.

., painkillers (like Vicodin), stimulants (like Ritalin or Adderall), sedatives or tranquilizers (like sleeping pills or Valium), or drugs like marijuana, cocaine or crack, club drugs (like ecstasy), hallucinogens (like LSD), heroin, inhalants or solvents (like glue), or methamphetamine (like speed)]?

Do they smell like marijuana?

I had a tenant growing marijuana in my backyard once and I didnt know how to handle it since it is still illegal here in NY. 

@Daniel SuarezIs marijuana legal in your state?

It was usually marijuana, opiates or meth. 

What about smoking marijuana when they have a medical marijuana card?