If the issue comes up after the lease has been signed without such a clause, the landlord would likely need to rely on an anti-drug or crime policy that hopefully was included in the lease.The landlord would then need to send written notice of the lease breach, citing the appropriate clause.

I remember reading Apartment Association newsletters about the problem, and they were advising landlords to never accept any tenant who had enough cash to pay up front, in case it was one of these bait and switch drug operations.I think there are other concerns, as far as taking the money could result in an "understanding" of a long-term lease, and it being harder to later evict, and possible tax problems, depending on the time of year the money is accepted.As I recall, I was reading about the meth lab bait and switch problem back around 2006 or 2007.  

I've seen posts about semi-war zones but nothing about full on war zones.Now when I say war zone I'm talking about very ghetto areas (drugs, guns, gangs, the whole 9 yards).

I have been envious of US Landlords' ability to check criminal records, this could be very useful, for example if a tenant has a history of illegal acts concerning drugs or similar issues.

We tell potential tenants that we do not rent to felons, sex offenders, or with any sort of drug or assault arrest even if there is no conviction.

He even admitted to drug paraphernalia being found in the unit.

They have survived blight, job loss, high taxes, an influx of drugs from the city, you name it.

Drug dealers with angry dogs?

. - Tenants complaining about gunshots, drug dealers, violence, etc. to try and negotiate rent, late payments, etc.

Is there a strong way to screen for drug or alcohol abuse prior to signing a new tenant?