It's a civil wrong, not a criminal one.It's what's known as a "tort". 

I don't have a process for credit checks but I do do a criminal and eviction check.

With double deposit escrow smart contract, the deposit account is only generated between the buyer and seller, and is only controlled by them.I understand that this new technology has gotten a bad rep from criminals evading taxes and rampant speculation from others, but it's simply an unfortunate side effect of any newly emerging technology.

He will be spending all his money and time on criminal defense.

he is basically a criminal..

The criminals sent an email disguised as title company to my agent asking buyer information, also in the email, forward some trivial information to me.

@Nancy Sathre-Vogel Sorry to hear about this unfortunate event.This person is criminal.

If we create our procedure now, then should we be okay to let everyone know of the max 3 occupant rule or do we need go through work history, then credit and criminal background checks first?

If they owe money and do not pay they are criminals in my book and I treat them accordingly.To simply decide it will not pay off and therefor is not worth seeking justice is a defeatist attitude.

Almost half of my portfolio has Section 8 tenants in it and as non section 8 people move out i try to move in more Section 8 tenants but i make sure my property manager screens them THOROUGHLY....not with just what's on paper regarding credit report, income and past criminal activity (If any).....I make sure my PM screens to make sure they have no pets, no evictions, no smoking OF ANY KIND and no felonies and we still get TONS of people calling...the biggest problem becomes picking someone from who is left.