Welcome Michael...BP is a helluva drug!

I bought a place with a drug dealer.

This is why cities demo houses all the time.. they suffer both syndromes. and then are targets for squatters drugs and other bad things.

I spit diet Coke on mine reading your post!

Otherwise, what's to say it's not just your cash you saved up but drug money from Columbia? 

Here are some examples of bad tenants:  Non payers, selling drugs in the place, attracting the wrong type of crowd, disrespectful to other tenants, hard on the units, etc..Another way to lose if to find tenants who are too transitory. 

In my experience, most ax murderers, drug dealers, and wife beaters have more than sufficient OTHER Bad Habits that will easily disqualify them without a lot of effort.

The person I caught selling drugs out of my home among many other things is now peacefully leaving now.

If they do drugs, I'll call the drug task force.

These street gangs only hack drug dealing competitors to death with a machete or spray public transit buses with automatic fire.