There are 2 links offered below. They link to recent articles from El Universal (Mexico City). This paper is comparable to the New York Times or the Los Angeles Times concerning its influence.
One article indicates 4 heads of state have agreed to prepare a single legal agreement that will provide the 4 governments concerned with a legal instrument to coordinate their judiciary work more efficiently. In the US, it could be phrased as 'making law enforcement coordination efforts more efficient'. But in the case of Latin America, we see the beginnings of an upgrade of separate legal and diplomatic systems between sovereign states.
The other article mentions briefly the growing realization among Mexican lawmakers, that there is a need to monitor more closely certain financial transactions, with a view to reduce money laundering. One of the details that prompted comments from MX congressaman Lozano, was the disclosure, from the MX federal government, to the MX Camara de Diputados (the Mexican counterpart of the US House of Representatives) that among the cache of weapons impounded between January and November 2008, there are cannon, grenades, rockets and explosives. Apparently most were traced back to the US.
http://www.eluniversal.com.mx/primera/32343.html
http://www.eluniversal.com.mx/nacion/165141.html