Am I required to tell applicant why I am rejecting them?

[Joe Butcher]

I'm about to start taking applications for my rent house.

If I reject a tenant who fills out an application (which is free) do I have to tell them that I am rejecting them and if so, do I need to tell them why?

Same question goes for applicants who pass the initial application phase but fail the criminal/credit/eviction screen.

Thank you.

Joe Butcher, Dallas TX