Landlords need to prove they are a landlord by providing documents like a mortgage agreement, utility bill, or purchase agreement for the rental property. They also need to provide ID and a document showing their current address. This verification process takes up to 10 days but only needs to be done once per credit check company. Before requesting a credit check, landlords should verify the potential tenant's name, employment, address and check references with previous landlords. It is important landlords follow proper procedures to protect themselves from future issues, even if tenants seem nice.