aid and property taxes, which would limit how much property taxes could be increased to compensate for the reduction in state aid. The budget lowered state capital gains taxes for investments in Wisconsin businesses. It increased spending on health care by $1.3 billion to cover increased costs for Medicaid, and increased transportation funding by $410.5 million. 2013–2015 budget proposal Walker's proposed budget for fiscal 2013–2015 froze spending on public schools and tightened the income requirements for Medicaid recipients. It proposed an increase in funding for fighting domestic violence, mental health care, higher education, and job training. It also included a $343 million cut in income taxes and an expansion of the state's school voucher program. 2015–2017 budget proposal Walker's proposed budget for fiscal 2015–2017 included a $300 million cut to the University of Wisconsin System, while holding funding flat for K–12 public schools and continuing to expand the school voucher program. It included a plan to borrow $1.3 billion to fund improvements to roads and infrastructure, and proposed drug testing for recipients of public benefits like Medicaid and food stamps. Domestic partner registry defense On May 13, 2011, the Walker administration petitioned the Dane County Circuit Court for permission to withdraw the state as a defendant from Appling v. Doyle, which was a challenge to the state's domestic partner registry. Regulatory reform bill On May 23, 2011, Walker signed legislation changing the process of creating administrative rules for the state. This measure, which became 2011 Wisconsin Act 21 (and became effective June 8, 2011), changes State agency authority to promulgate rules, provides for gubernatorial approval of proposed rules, revised the requirement of an economic impact analysis for proposed rules and changes venue in the process of judicial review of agency rules. Voter ID law On May 25, 2011, Walker signed a voter ID law that required voters to show a government-issued ID before casting a ballot. The ACLU filed a lawsuit in federal court to invalidate the law on December 13, 2011, claiming the law violates the constitutional guarantee of equal protection under the law. On April 29, 2014, U.S. District Judge Lynn Adelman struck down the law, saying it violated the Voting Rights Act and U.S. Constitution. The Wisconsin Supreme Court upheld the constitutionality of the voter ID law under the Constitution of Wisconsin in two other cases in July 2014. On September 12, the 7th Circuit Court of