Wisconsin
Cannabis is not decriminalized on a statewide basis.
On April 5, 1977, Madison passed Ordinance 23.20, which made possession of less than 112 grams (almost a quarter pound) of marijuana or 28 grams of cannabis legal when for personal use in a private place.
On May 13, 1997, Milwaukee mayor John Norquist signed a measure into law, which made possession of less than 25 grams (0.88 ounces) of cannabis a municipal ordinance violation with a fine of $250 to $500 or imprisonment for 20 days. Although, prosecutors in Milwaukee can still charge offenders under more severe state law.
On July 24, 2011 La Crosse Wisconsin, people who are caught with seven grams of marijuana or less for the first time, could receive a ticket instead of being arrested. Though the final decision is up to the officer to arrest or fine.
Read more about this topic: Places That Have Decriminalized Non-medical Cannabis In The United States