Thanks to a new state constitutional amendment, recreational cannabis has been legalized in Missouri. Yes, Amendment 3 passed, but let’s not light up the sky in celebration yet. Marijuana possession laws are still on the books until Dec. 8. The Missouri State Highway Patrol and your local police department would love nothing more than to make a few more marijuana arrests for good measure before the new law goes into effect. Attitudes toward the leafy green plant are changing. And that was reflected in Tuesday’s vote. The new adult-use marijuana law, approved by a large majority, is no panacea …