There is a proper way to screen potential tenants before allowing them to move in to your home or property. Credit checks, employment history, Character References and back ground checks are a good form of screening prospective Tenants. Last two known address is a good source as well, I would rely more on the landlord prior to the current landlord. Why? Because some landlords will give good referrals to tenants they no longer wish to deal with. I would also suggest to visit them at their current location if possible. You should also visit your Landlord Tenant Court in your county or the county of the prospective Tenant to see if they have had landlord tenant issues.