The Colorado Department of Revenue Marijuana Enforcement Division released initial regulations 
for the state’s impending legal marijuana industry on Monday, bringing the implementation of Amendment 64 one step closer to completion.
Denver's Westword compiled a pretty good summary of the new rules, which cover the licensing and application process; production and sales models; and security and labeling requirements.
It is important to note that these are emergency rules that were created in accordance with the timeline established by Amendment 64. The Department of Revenue will now carry out a lengthier process to develop a final set of rules.
Marijuana retail shops will be able to begin opening in Colorado on January 1, 2014. Colorado residents age 21 and over will be able to purchase up to one ounce of marijuana from a licensed and regulated store; non-residents will be able to buy up to a quarter of an ounce at a time.