If you want to set yourself apart, be courteous and professional and respect their time.Their main concern would be people looking in medicine cabinets for drugs and in dressers for jewelry.

@Michael Porche isn’t Medellin Columbia place to lots of drug issues ?

Also, make sure you hold on to a property as a rental so you don't end up being designated as an IRS "dealer" (a tax term) that takes about 1/2 of your profits.

Question is should my tax returns for my LLC file me as a dealer or investor?

and knee deep in the mindset change that comes from the gateway drug that are the Kiyosaki books and Think and Grow Rich, and stuff online like BP.

My part time job is giving them pre-employment drug screens before they can start work. 

Also you can only sell so many homes a year and not have to have a dealer license.

My biggest concern though would be the heavy drug use in that area.

The IRS could consider you a "Dealer" and take away many of the tax advantages of rentals. 

If ONE unit is vacant and both units are equal in rooms/bathroom composition, then the new owner will need to move into the vacant unit and then the owner can either evict to take the occupied property completely off the rental market (5 years off the rental market), evict to take back the occupied unit for personal use like moving in immediate family (2  years off the rental market), or they can evict given the tenant is a nuisance or conducting illegal activity (this is a harder method to evict since you have to provide evidence and have a case but if they're selling drugs and you have video footage or something, then make your moves) and there are a few other reasons for at-fault evictions.