The selling of Marijuana may become legal in Colorado on Jan. 1, but that doesn't mean it will be legal at the airport. Travelers will not be able to carry marijuana at Denver International Airport.

Denver International Airport will become the first city location to ban marijuana possession. It is doing so to fight against illegal trafficking between states according to the Denver Post. This policy will start in early January.

A few restrictions have been placed on marijuana ever since it became legal to possess it. However city ordinances have banned the display and transfer of marijuana on city-owned property like parks. It isn't illegal to carry it though.

"We didn't want to impact other airports and other agencies, and we didn't want to facilitate transporting marijuana across state lines," airport spokeswoman Stacey Stegman told the Post.

Under federal law, marijuana is still illegal. According to Denver Assistant City Attorney David Broadwell, the airport is allowed it set its own rules under state and city law. The Transportation Security Administration does not allow pot possession. Even medical marijuana is prohibited.

Even though the state is legalizing marijuana, the TSA says its own policies will not change.

Those over 21 in Colorado can possess up to an ounce of marijuana legally. Residents can purchase an ounce and tourists can purchase a quarter-ounce at a time. All of it must be consumed in the state. Starting New Years Day, dispensaries will be able to sell marijuana to anyone over 21.