We can thank an over-burdened and under-funded legal system for that. 

Everyone is calling for Walker to cut State spending, but it seems like they really don't care where the cuts are being made, or the repercussions of said cuts. They've already closed down one jail, cut over $2.1M from the corrections budget and laid off staff which means fewer criminals are actually seeing the inside of a jail cell and the guards they do have are overwhelmed. The Department of Law has lost over 76 positions and had just over a quarter of it's budget slashed meaning there are fewer prosecutors to take on these cases, and the ones that are still around have overwhelming case loads (the number of cases the prosecutors had to decline to prosecute rose 6% thanks to these budget cuts, which means more criminals never even being charged), The Department of Public Safety (Troopers) have lost over 68 positions, closed two posts, and lost 17 vehicles from their fleet. So yeah, government at it's finest.