28 CFR 570.32: Types of furloughs.

A furlough is an authorized absence from an institution by an inmate who is not under escort of a staff member, U.S. Marshal, or state or federal agents. The two types of furloughs are:

(a) Transfer furlough—A furlough for the purpose of transferring an inmate from one Bureau facility to another, a non-federal facility, or community confinement (including home confinement) as noted below at § 570.33(a).

(b) Non-transfer furlough—A furlough for any purpose other than a transfer furlough, and which may be defined based on its nature, as either emergency or routine, as follows:

(1) Emergency furlough—A furlough allowing an inmate to address a family crisis or other urgent situation as noted below at § 570.33(b).

(2) Routine furlough—A furlough for any of the reasons noted below at § 570.33 (a) and (c) through (j).

(c) Duration and distance of non-transfer furlough—

(1) Day furlough—A furlough within the geographic limits of the commuting area of the institution, which lasts 16 hours or less and ends before midnight.

(2) Overnight furlough—A furlough which falls outside the criteria of a day furlough.