The United States has signed a free trade agreement with Columbia, but it has not yet been ratified by Congress because it claims to want to see evidence of a significant improvement in human rights. All indications are that Congress is not even close to ratifying the agreement. We could therefore deduct that the United States does not believe the human rights situation has significantly improved. Americans like to do business. They choose to ignore human rights in some countries, but in this case, they are using human rights as a reason to refuse to ratify the agreement.
On April 16th, 2008. See this statement in context.