Wis. Stat. § 302.386
In Fields v. Smith, 712 F. Supp. 2d 830 (2010) the U.S. District Court for the Eastern District of Wisconsin granted a permanent injunction restraining the enforcement or attempted enforcement of sub. (5m) because any application of the statute would violate the 8th Amendment and Equal Protection clause of the U.S. Constitution. The U.S. Seventh Circuit Court of Appeals affirmed the district court at 653 F.3d 550 (2012).