Final answer:
Depositions are conducted by the courts, which is the branch responsible for overseeing legal proceedings and part of the U.S. Criminal Justice System.
Step-by-step explanation:
The branch of the U.S. Criminal Justice System (CJS) that carries out depositions is the courts. Depositions are part of the pre-trial discovery process where witnesses provide sworn testimony. The judiciary, specifically within the courts, is responsible for overseeing legal proceedings, including depositions. State and federal courts form the judicial system where legal disputes are resolved and law is interpreted and applied.