A reason for cause is usually listed if landlord files for eviction during a lease period such as non-payment of rent, violation of lease - violence, drug use, unauthorized occupants etc.. 

Any seller not on drugs should be asking about the benefits and risks of keeping a mortgage in their name when they don't own it.

"drug dealers"Dad?

Told me about extensive drug activity in the area.

Unless you're involved in drugs or fighting with family.

(Drugs).

Baby diapers, drug needles, etc.  

You may have to press charges to the fullest extent if it becomes an issue (The trespassing, drugs, intoxication, exposing ones self, breaking and entering, assault etc)Good Luck!

Much stricter penalties for drug dealers?

A solid lease will have that early termination clause, require renter's insurance, and have an addendum stating the property rules (like "this is a drug-free/crime-free property" and more).