28 CFR § 570.31 - Inmate eligibility for furloughs.
(1) Sentenced inmates housed in Bureau facilities.
(b) Ineligible inmates. The following types of inmates are not eligible for furloughs:
(1) Sentenced inmates housed in contract facilities are not eligible to participate in the Bureau's furlough program under these rules, but may apply for furloughs as specified in that facility's written agreement with the Bureau.
(2) Inmates who are U.S. Marshals prisoners housed in contract facilities are not eligible to participate, but must direct any furlough requests to the U.S. Marshals.