Family Support Act
Law passed in 1988, with two major mandates: Immediate Wage Withholding, unless courts find that there is good cause not require such withholding, or there is a written agreement between both parties requiring an alternative arrangement; and Guidelines for Child Support Award Amounts, which requires States to use guidelines to determine the amount of support for each family, unless they are rebutted by a written finding that applying the guidelines would be inappropriate to the case.
Source: Office of Child Support Enforcement.