The theme of the essay focus the Frontier Safety System of the Mercosul. Making use of documental and field researches data covering the integration among Brazil, Argentina and Uruguay in relation to the patrolling of their frontiers were collected and analysed.

       Historically, the relationships among men created mechanisms to exchange, sell and buy products, in such a way that a peculiar inter-relation in the boarders of these countries was outlined. The improvement of this relation becomes an exigence arising from the transformation occurring in the international work division and from the emergency of the globalization paradigm. Since then, it has been possible to observe a market opening and the formation of geopolitical-economical blocks, valorizing solidarity and regionalism among countries for geographic proximities and interests in common. The customs limits and the national sovereignty policies become more flexible with the purpose of forming a judicial mode of ruling the complementarity of national sovereignties.

       There are several examples of countries integrated in geopolitical blocks, among which the outlighted European Community and the Mercosul, responsible for the creation of new supranational legislations to help the workability of these blocks. One example is the "Recife's agreement", with the purpose of making a political integration possible, unifying custom codes and the frontier mechanisms of control, as a consequence of this fact there is the establishment of "Integrated Control Areas" in the frontiers, aiming the setting up of technological and operational measures, for an integrated working of customs, migratory, sanitary and transport control.

        The supranational treaties and agreement among Mercosul countries promoted a free traffic among inhabitants of the limitrophe municipal districts and resulting in a number of touristic and political activities and even in weddings celebrated between non-native people. In this context of integration, the guiding interrogation points of the research emerged: how is the integration work betweeen Brazil's, Uruguay's and Argentina's frontier getting accomplished? What kind of formation and training do police officers receive to work in the Frontiers Integrated Control Areas? What are the exigences, difficulties and possibilities for integrated work in frontiers?

        Researches results have shown that there are historical, structural and formation differences between Brazil's, Argentina's and Uruguay's frontier police, which persist even after the configuration of the Mercosul. The frontier safety systems in these three countries are still deep-rooted, connected to a more traditional patrolling, showing characteristics which are very peculiar in each one of these countries: a strong attachment to administrative burocratism, an entirely national sovereignty optics of deffense, a military type of patrolling.

        It has also been testified that the integration deffended by Mercosul is far from being what is wished: there is an insatisfaction shown by every police officer interviewed in relation to the training that has been provided for them, (in fact the real complaint is that of a total absence of official integrated training), aiming their preparation to work on the integrated patrolling of the frontiers.