"But the law is the law, and that is why he has directed the Department of Justice to review these ballot initiatives and make some assessments about how to proceed," Carney said.
In the department's most recent statement on the issue, the U.S. attorney for Colorado said Monday that the department's responsibility to enforce the federal Controlled Substances Act "remains unchanged."
"Neither states nor the executive branch can nullify a statute passed by Congress," U.S. Attorney John Walsh said. "Regardless of any changes in state law, including the change that will go into effect on Dec. 10 in Colorado, growing, selling or possessing any amount of marijuana remains illegal under federal law."
Walsh added: "Members of the public are also advised to remember that it remains against federal law to bring any amount of marijuana onto federal property, including all federal buildings, national parks and forests, military installations, and courthouses."