Vending machines in Montgomery County (Md.) schools will remain dark for 30 minutes after the last bell rings, so that students cannot load up on snacks and treats before heading home. Lindsey Parsons, co-founder of Real Food for Kids-Montgomery, told The Washington Post that her group worked with district officials to come up with the stricter rules. Under the old policy, vending machines came on as soon as classes were dismissed. The policy applies only to vending machines carrying food that don’t meet the school system’s wellness guidelines.