Generally, the 28 “Congress used the terms ‘custody’ and ‘detain’ interchangeably and did not intend for them to be afforded different meanings.” Matter of Aguilar-Aquino, 24 I. & N. Dec. 747, 752 (BIA 2009). 29 ICE receives appropriated funds to pay “necessary expenses for enforcement of immigration and customs laws, detention and removals, and investigations.”