Screening tenant and his wife

[Brett Hearn]

Hi all I have what sounds like a simple question.  I am currently screening a tenant who and he will be having the background check.  Should I be doing a background on the wife as well.  She is not a co-signer so I don't see any reason why we need to.  As long as she is listed on the application do you guys think that is sufficient? Thank you in advance.  I really don't want to screw this up.