Ya-know, it kind of makes me think of diet fad's to be honest. 

Another girl showed up high on drugs.

Most crime is drug related (heroin).  

We do have this in our lease regarding illegal drugs: “No illegal drugs or controlled substances (unless specifically prescribed by a physician for a specific person residing or present on the Premises) are permitted on the Premises.

Her parents will keep an eye on her and if she does slip back into a drug habit it's likely to happen away from the house since probation can pop up any time.

The other hole (though alluded to) is that high cost, high appreciation market homes are almost B class or higher by definition because the incomes required to support the rental base eliminates C and below tenants, ie Section 8, other housing voucher tenants, illegal immigrants, criminal background, drug issues, etc.

To me, house hacking is the gateway way drug of the real estate world.

If drugs are an issue he can try to get the guy arrested off site especially if he knows  where he is selling stolen property or if he has drugs on him.

I'd call it a D not an F, maybe some F blocks mixed in depending on recent gang/drug sales situation.

Your standard ghetto Cleveland duplex complete with all of the normal ghetto duplex type stuff....Drugs, crime, blight, evictions etc...What was different about this duplex was the out of state owner is/was a total lunatic.