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The amendment legalizes up to an ounce of marijuana, but it can't be consumed in public and you have to be 21 years old or older to purchase it.

The state attorney general's office says you can only purchase marijuana from specific licensed stores. These pot shops aren't expected to open until late 2013 or 2014.

The amendment also allows for a person to grow up to six plants. But, according to the Colorado State Patrol, if there is probable cause that someone is driving stoned, they could be taken in for a blood test.

If someone tests positive, they would be charged with a DUID, driving under the influence of drugs, and face the same consequences of driving drunk.

The issue here is there's no legal threshold saying what is "too stoned" to drive. That is something that is expected to be taken up for the third time in the coming legislative session.

Legislators also have to come with a regulatory structure and put a tax question on the ballot in November that would allow money from the sales of marijuana to go to public school construction projects.

According to attorney Robert Corey, marijuana shops will not be allowed to document the identification of buyers or make a photocopy when a purchase is made. He also says shops will be at least 1,000 feet from a school.