Action should be as needed to alleviate the situation.

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.

This is not just some slum drug either, it's popular amoung young professionals as well.I don't know what made me think of that, perhaps I just tried to hard to figure out how paying off my mortgage was like making the bank a market rate loan or paying off my loan was a poor use of my money. .hmmmm?

It's no worse a drug than alcohol, can bring in revenue, and help cops focus on the 'real' crimes.

One time tried to sell drugs on his own lot and his mom called the cops on him and later kicked him out of the house, nevertheless he comes back once in a while and his younger brother is on the same path.Now they see my property being unattended and started to hang there.Should I call the cops on them?