Derek Kravitz is the contributing research editor at ProPublica.
Al Shaw is a news applications developer at ProPublica. Previously he was Designer/Developer at Talking Points Memo and creator of TPM's PollTracker application.
Colorado’s Marijuana Enforcement Division can take months or even years to issue formal safety warnings about marijuana products even when it receives reports that the products are harming people’s health, The Denver Gazette and ProPublica found.