Colorado Rep. Jonathan Singer, D-Longmont, front, responds to questions as Dr. Larry Volk, executive director and chief medical officer of the Colorado Department of Health and Environment looks on during a news conference to announce the rollout of the $5.7-million, state-sponsored advertising campaign Monday, Jan. 5, 2015, in Denver. The quot;Good to Knowquot; advertisements will focus on marijuana laws and health effects, including the ban on use in public places, age restrictions, DUI laws, the dangers of overuse and other concerns related to the use of the products. (AP Photo/David Zalubowski)
