Do you have any type of criminal background? 

Harry teaches at our local board and just spoke at our local REIA regarding the new regs on blanket denials of tenancy by people with criminal histores.

If it is to stop trespass, the police might be a better route as trespass is more criminal than civil.  

Butts was arrested and charged Wednesday with arranging an attack for cash on her landlord over an ongoing dispute, prosecutors said.Ashley Melissa Butts, 30, of Inglewood and her friend, Israel Rios, were taken into custody on an arrest warrant stemming from the April 30 attack, according to a Los Angeles County Superior Court complaint.Butts and Rios are charged with assault by means of force likely to produce great bodily injury, conspiracy to commit a crime and first-degree burglary.Shortly after Butts moved into her landlord’s home in the 3300 block of West 78th Street in Hyde Park, they began quarreling, prosecutors said.According to the criminal complaint, Butts called Rios on her cellphone and instructed Rios to come to their home, so that he could attack the victim in exchange for cash.Butts allegedly then had an Uber driver pick up Rios, 37, and an unidentified man and drive them to her home.

Running a credit and criminal check without a SS# is a waste of time. 

I was wondering, can you put a clause in your lease that says if the landlord even suspects criminal activity with or without proof, the tenant could be found in breach of the lease and evicted.

How do you know these extra people aren't criminals?

Many posts assume the tenants are criminals.

Also someone who tries to "talk" you into accepting them with visions of "hey, I've got the security deposit and first months rent right here" so you can skip the credit/criminal/income/previous rental history (that's often the last rent you'll ever see from them) .  

Unfortunately it's much more difficult to obtain credit and criminal backgrounds on Canadians and other foreigners.