The reasoning behind compelling users to register with the state?

Mujica feels Colorado’s system will lack the circuit breakers needed to keep tabs on consumption, and see red flags if a person seems addicted or headed to addiction.

Someone needs to tell President Mujica the topic is marijuana, not heroin.

Requiring recreational users in the U.S. to register with the Government would just ensure the continued viability of the black market, so users could avoid identity checks. It may work in Uruguay where the Government is selling its own brand of pot for $1.00 a gram, but that's never going to happen here. Our federal government can't even take a stand on decriminalizing pot use -- it would take another century for the feds to agree to sell it (and forego taking a profit.) Plus, who wants the Government controlling production? Colorado's system, with its tight regulatory controls from seed to sale is far better.

What's behind his criticism of Colorado anyway? Wouldn't it be better for him to support Colorado's new law and work together for global reform?