Given that states conclude that their existing laws allow for the entry into mutual aid agreements or when they adopt new laws to obtain such power, concerted efforts should be made to share and make the most of the lessons learned among themselves. Similarly, strategies to meet the constitutional requirements of the federal state should be pursued jointly. Non-binding agreements can be a convenient way to exchange health information. However, liability, compensation and reimbursement issues related to the distribution of supplies, equipment or personnel (in the event of an undeclared emergency outside the EMAC) can only be dealt with effectively in mutual assistance agreements that create binding obligations for the parties. States may be comfortable concluding binding agreements drawn up taking into account existing judicial interpretations of the compact clause or useful proposals from the Department of Foreign Affairs. Or, like EMAC and PNEMA, states may decide to seek congressional approval for binding agreements. The Congress agreement on PNEMA (particularly if IEMAC subsequently obtains approval), coupled with the Confederation`s strong promotion of state mutual assistance, suggests that congressional approval of an international EMAC agreement covering all states along the borders between the United States, Canada and Mexico could be possible. Regardless of the type of mutual assistance, mutual assistance agreements are essential in defining the rules, procedures and procedures to be followed in terms of the exchange of information, resources or personnel. In particular, with regard to the sharing of resources or staff, binding agreements must necessarily deal with the issues of liability, reimbursement and compensation for workers. In response to the growing recognition of the importance of mutual assistance agreements, the Public Health Law Program of the Centers for Disease Control and Prevention has made efforts to characterize the legal framework for mutual assistance. In particular, the programme collected information on mutual assistance and related laws for the categories of intergovernmental and international mutual assistance, systematically established and synthesized information, conducted basic complementary legal research, and evaluated and identified legal approaches to achieving effective mutual assistance.