Welfare Integrity Act of 2013 - Amends part A (Temporary Assistance for Needy Families) (TANF) of title IV of the Social Security Act to require state TANF programs to operate a program to conduct random testing of TANF applicants and recipients for illegal drug use.
Requires state TANF programs to deny assistance to individuals who test positive for illegal drugs and individuals convicted of drug-related crimes.
Prescribes an administrative penalty for failure to implement illegal drug use testing.