This volume describes the methods by which United States law enforcement agents and prosecutors obtain investigative information and admissible evidence from abroad and provide asistance to foreign law enforcement agents and prosecutors in obtaining such information and evidence in the United States -including the constitutional provisions, statutes, rules of criminal procedure, regulations, treaties and other procedures governing the obtaining of such information and evidence. It also discusses the methods and means available to defence attorneys obtaining evidence from abroad for defence of their clients. Appendices include relevant United States statutes and regulations, US Department of Justice Manual materials, and selected treaties, executive agreements and memoranda of understanding governing the obtaining of investigative information and evidence in transnational criminal investigations and cases, as well as model letters rogatory, applications for letters rogatory, and an annotated list of useful websites.