Denying rental application

[Brian Bonnie]

Hello BP, my name is Brian and this is my first post!  My fiancee and I have a rental and are looking for new tenants.  I am curious on how people are declining tenants.  I have gotten a lot of people with criminal records, bankruptcy's etc.  When I have been declining them I have been giving them a denial letter that I have found online.  I know that I cannot decline based on gender, age, etc.  Are there any extra steps that anyone takes to make sure that the applicant cannot come after me for denial?  Thanks for your help.