To require States to withhold assistance to applicants for, and recipients of temporary assistance for needy families with respect to whom there is substantial evidence of recent unlawful drug use.

Amends part A (Temporary Assistance for Needy Families) (TANF) of title IV of the Social Security Act to subject applicants for, and recipients of, TANF to drug testing and the withholding of assistance when there is substantial evidence of recent unlawful drug use.