Ron Kammerzell is at the center of Colorado’s experiment with marijuana legalization. As the director of enforcement at the Colorado Department of Revenue, Kammerzell has overseen the implementation of regulations on legalized marijuana sales following Colorado voters’ approval of Amendment 64, which legalized pot in the state, in 2012. Given all the attention surrounding Colorado’s growing marijuana industry, I reached out to Kammerzell to discuss how he sees Colorado’s experience going so far. This interview has been edited for length and clarity.

Read more: Colorado’s director of pot enforcement thinks legalization is going great | Vox.