Interpol (International Criminal Police Organization), a cooperative association of more than 170 national law-enforcement agencies. (The United States is represented by an official of the Treasury Department.) Interpol keeps records on international criminals and maintains a vast communications network for exchanging police information. It does not employ investigators, but members often conduct investigations for each other. Interpol was formed in Vienna in 1923 and reestablished in Paris in 1946. Headquarters are in Lyon, France.
In the United States, the Federal Rules of Evidence determine whether a piece of evidence can be considered at trial. There are three main criteria for entering a statement or object as evidence at trial: relevance, materiality, and competence.
The United States is renowned for having one of the most sophisticated judicial systems in the world. Every day thousands of people take part in this system, hoping to settle disputes and work for justice. Learn how the U.S. judicial system works.