Every time we sign a treaty with another country, the treaty (should) include prisoner transfer provisions.... Under these provisions, the country in which the crimes were committed could demand that the convicts' country of origin incarcerate the prisoners for the terms to which they were sentenced.... Foreign felons in U.S. prisons are exacerbating out budget and law enforcement problems.... We will never get countries to take back their prisoners unless we have some leverage. NAFTA gives us that opportunity.