Gerry Leone, Middlesex District Attorney, speaks at a news conference, Sept. 17, 2008. Community leaders opposed Question 2, a proposal to decriminalize marijuana in the Commonwealth. (AP/Bizuayehu Tesafye)Back in November, Massachusetts voters passed a ballot measure -- called Question 2 -- that, on Jan. 2, will turn possession of an ounce or less of marijuana into an offense on par with a traffic violation. Now police and prosecutors are wondering how the heck they're going to enforce it. Here's the story from the Boston Globe.Among the questions enforcers are trying to answer: What should police do with people caught...