Most of these have drug out all summer long and many of these tenants haven't paid for most of the year. 

I don't think it's because the poor are all drug addicts.

This is also how we deal with drug dealers.

If mom and dad pay the bills while their 19-year-old lives with them and goes to college, I still run a credit/criminal on the kid to ensure he's not a drug dealer, sex offender, or whatever.

Lots of shootings, gangs, race riots, drugs, poor schools, and the highest crime rate in the USA."

Knew where to buy certain drugs and who were the big names on the block.

Additionally, the lease also states reason for evictions (like drug use).Just because your tenant allowed that lady to stay, that does not mean she has the right to stay unless you added her to the lease or gave your tenant permission to stay.

I came to find out that the house was on a drug infested block, with boarded up abandoned homes next door.He said that the appraisal was off because they used the wrong comps and urged me to get a new appraisal with a different appraiser.

A competing drug dealer?

It might be a good idea to have your lease forbid blocking windows with foil, or other opaque items other than curtains or commercially available window blinds (that are not flags or political).Drug dealers, and fake drug dealers tend to block windows so no light can get in, and no Police Officers can see in.As far as flags it's not a proper venue for National flags, and gives you leverage in case someone decides to hang flags offensive to some (such as public display of WWII Axis flags, or socio/political flags) that might be detrimental to your rental business.Good Luck!