>> my name is lewis koski. i'm the director of the colorado marijuana enforcement division. >> things are different in colorado. >> it's the dmv for weed. >> the biggest challenge to this policy is how unique it is. it's really unique around the world. along with that certainly comes the challenges of being first. when we first started, there were no best practices developed on how you're going to regulate something like this. >> marijuana enforcement, this is lewis. >> from a public perspective, one of the biggest concerns everyone has is adolescents and youth. >> you are clear for takeoff down runway 420. >> but if the high-rolling marijuana business has hit a bump, it's edibles. >> it's very different from smoking. it takes a lot longer through the body. >> some first-time adult users have said edibles have made them paranoid and hallucinatory.