You may see signs of gang activity, drug dealing, prostitution, etc.  

The buyers are trying to say they bought the briefcase, not the drugs inside in their back alley transaction, getting a good deal.

Wholesalers try to skirt laws and usually trash standards of ethical  conduct, it's like a back alley drug deal, under  the radar of regulators......and you want to put it on the internet? 

Local to me many of the properties that look vacant from the street are actually drug labs.

Otherwise, you may look like you're justifying the value of a drug dealer to an addict. 

A 7 cap is absurdly low for Lansingburgh, that area is one of the sketchiest in the capital region, half the houses are boarded up, theres a TON of rental inventory on the market because even low income renters are fleeing the drug violence.  

@Jake Peterson @Brandon Turner has a couple good recommendations for deciding if you're in a good location in his book "The book on rental property investing"... he gives a few different tools to search withCrime stats - www.crimereports.com Schools - www.greatschools.orgjobs versus unemployment - he said he uses www.city-data.com drug use in the area the overall look of the neighborhood done by just driving around

In contrast, we had someone break into the washers and dryers on numerous occasions, a drug dealer, a pot smoker, a gal who had boa constrictors, and more issues in a month than my 9 SFRs had in a YEAR. 

They arrested her a month ago for drug charges and now she is out on pretrial release to her parents.

The previous owners had everyone sign a "Anti-drug lease addendum".