This paper finds that several tools of the child support enforcement system - the $50 pass-through, the tax intercept program, and presumptive guidelines - had a significantly positive effect on child support receipt among both never-married and previously married single mothers. Immediate wage withholding also had a significantly positive impact on child support among previously married mothers on AFDC. The in-hospital paternity establishment program had a significantly positive effect on child support among never-married mothers not on AFDC. This paper examines 21 years of data from the Current Population Survey supplemented with detailed information on state child support policies.