Penal Code section 1465.8, subdivision (a)(1)’s $20 court security fee may be imposed on defendants whose crimes were committed prior to its August 17, 2003, effective date. The imposition of the fee does not violate ex post facto provisions of the federal and state Constitutions. The $20 fee was part of a budget trailer bill, and was not enacted as punishment. A minimal fee, imposed for a nonpunitive purpose and without punitive effect, is not subject to the limitations of the ex post facto clause.