What document establishes authorized procedures for interrogating detainees?

The document that establishes authorized procedures for interrogating detainees is the U.S. Army Field Manual 2-22.3, also known as the "Human Intelligence Collector Operations" manual. This manual outlines the legal and ethical guidelines for conducting interrogations, emphasizing adherence to U.S. law and international treaties, including the Geneva Conventions. It aims to ensure that interrogation practices are effective while respecting human rights and maintaining the dignity of detainees.