noun
branch detention house
A branch facility of a detention house, used for holding suspects or defendants in criminal cases. This is a specific legal term.
彼は拘置支所に移送された。
He was transferred to the branch detention house.
拘置所 is a main detention house, while 拘置支所 is a branch facility.
Compound of 拘置 (detention) and 支所 (branch office).