Who must request for a federal inmate to be admitted to detention facilities?

The requirement for a federal inmate to be admitted to detention facilities typically involves coordination among various officials in the federal justice system. Each of the roles mentioned plays a part in the process, which makes the answer that encompasses all of them correct.

The United States Attorney is responsible for prosecuting federal offenses and may request the detention of a defendant during the pre-trial phase. The United States Marshal, on the other hand, is responsible for the transport and custody of federal prisoners. The United States Commissioner, who presides over certain preliminary hearings and other judicial functions, may also play a role in determining the need for an inmate's detention based on the proceedings before them.

This collaborative process ensures that all legal protocols are observed and that the rights of the incarcerated individuals are upheld. Therefore, the answer indicating that all the listed positions must be involved in facilitating the admission of a federal inmate to detention facilities accurately reflects the multifaceted nature of the admissions process in the federal justice system.