I am not interested in policing that type of activity. 

The last thing you want is for the police to conduct a drug bust.

And, if his customers are sketchy, there could be issues with them, too.And would your insurance cover damage caused by it.I'm assuming it's legal, but prior to it being legal here, the power company would tip off the police if a place started using lots of electricity, then you have the police showing up, too.And, don't remember if someone else mentioned this, but is it legal to run a business out of your property? 

Your city may require you to attend a Crime Free/Drug Free class to be certified, this is a good class and get set up and take it, call your police department where the property is located and find out more.Apartment buildings are sold everyday, Some with 100's of current tenants with leases that are transferred so your not assuming something that other landlords haven't done and will continue to do.

It's a tough situation to "police."

No, we don't think you do drugs, but we will still tell you (and our police officer tenant) that any drug related crime on the premises will get you evicted. :-)We do have friends that we wouldn't rent to.

My lawyer subpoenaed a police officer from the drugs squad to testify and we had quite the Law and Order episode.

What's usually required is that Proof of executor for the tenants estate is obtained before you permit anyone other than police to remove anything from apartment.. the person that contacted you should provide authorization from a  attorney or give you name of executor, so you can release the unit to them.

Anita Anita,There are many forum threads here on BP about areas but here's my take on it:A - location where you and I (and everybody here on BP) want to live in (very low crime, no houses or apartments with boarded up windows, schools are the best in the country or best in the state or best in the county)B - a grade below A, this is where the middle class lives, good school district, still low crime rateC - this is lower middle class, higher crime rate, schools middle of the road in terms of rating, rarely do you see a house/building with boarded up windows but it happensD - clearly lower income area, very high crime rate, one house per block is boarded upF - this is called the WAR ZONE, every other house is boarded up, drug dealing and prostitution happening in every other corner specially at night, graffitti galore and even the police is afraid to go there because this is where 90% of violent crimes happenI started with Fs/Ds and I thought I went to heaven when I got Cs.

better watch out the BP police are everywhere