I have wondered if perhaps he has a drug problem or some nasty debt that he needed to pay ASAP.

The Federal Government can Trump the states.Marijuana is still a Schedule 1 drug (LSD, Cocaine, etc) for some reason.

For example, our cabinetry was 40% less than our lowest proposal because I took the time to go directly to a manufacturer and become a dealer (there's a lot of mark-up in cabinets). 

My question is this: How do you organize/summarize location characteristics (i.e. crime, drugs, schools, unemployment, population growth, etc.) for each of the properties that I have found in a way that makes it easy to compare and contrast those properties? 

You are correct, if the home has been moved more than from the factory to the site or the dealers lot to the site, then all conventional and government financing is now not available for those properties. 

Saturday, I found a tenant allowing her 'boyfriend' to provide a drive up drug delivery service from her apartment .

Even if you miraculously pulled a deal out of a hat, found a buyer, and it actually closed, it would be weeks before you get paid from it.Outside of robbing a bank or selling drugs I can't think of a way to make $1500 that quickly.

What’s the general consensus on homes that were prior drug productions?

But for people who actually care about running a property in a low income area, renting to registered humans is a far better investment than renting to someone who has a history of drugs or gangs. 

Had a guy not show up for work and gave him a welfare check, I found him unconscious and unresponsive due to a drug overdose.