In November, voters in Jackson, Michigan voted to pass a city ordinance that decriminalized possession of up to one ounce of marijuana. The ordinance applies to those 21 and older on private property. Now, Jackson police are determining how to enforce that law and what the law means by “private property. “ Jackson Police Chief Matthew Heins said the city police department has advised its officers to follow the new law. "First and foremost, it was my objective to enforce what voters voted on," Heins…