Page 26 of 42 103 Minn. L. Rev. 844, *894 branch is firmly committed to a robust enforcement policy against local government corruption that is also criminalized under state law, and Congress has supported this agenda by enacting federal crimes intended to duplicate, or greatly overlap, state offenses. !°4 In fact, federal statutes used in anti-corruption cases - [*895] like other federal criminal statutes - rely on and incorporate state law in federal offense definitions. In light of this structure, federal prosecutions can claim to effectuate state law goals - an especially straightforward version of federalism-based enforcement redundancy. !® 2. Sexual Assault In sharp contrast to public corruption, enforcement redundancy through coextensive jurisdiction is largely nonexistent for a large portion of the serious crimes that dominate state felony dockets, including sexual assaults, domestic violence, and homicide. !©° Federal law reaches only a small number of these offenses when they intersect a special basis for federal jurisdiction, such as interstate conduct - like human trafficking - or wrongs that occur on federal property or involve federal employees. !®’ For most kinds of homicides, the lack of redundancy is only a modest hindrance to adequate enforcement; holding aside distinctive exceptions - such as homicides by police or racially motivated lynchings - there 1s little evidence to suggest patterns of homicide underenforcement in state justice systems. !°8 Domestic violence and sexual assaults are a different story. Like local public corruption, sexual assaults have long been a key example of [*896] serious wrongdoing to which the responses of state and local criminal justice agencies have been deeply problematic. 1° Underenforcement is hard to measure for sexual assaults as it is in other contexts, but central features of the problem are clear enough. Rape and other forms of sexual assault are dramatically underreported crimes. !7° The leading government