Wisconsin's FOIA is pretty standard
"Police records are presumed public and, like all records, their release is subject to the common law balancing test. The Wisconsin Atty Gen in 1988 issued a directive that states, some cases, the police department withholds records claiming their release may interfere with an ongoing investigation.
The Wisconsin Supreme Court, however, has held that, at a minimum, daily arrest records are open to the public, regardless.
The State Court in 1991 held that district attorney files (as opposed to police records) are not subject to public access, even after the trial and all appeals have been concluded.
A denied request in Wisconsin can be appealed, to various state courts, but it takes about 2 years on average to reach a final appeal in Wisconsin.
Also anyone (resident or non-resident) can file an FOIA claim in Wisconsin and charges are to set to actual costs. There is no timeline mandated to respond, the law states "respond within a reasonable time."