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TRAC Fellows compiled and merged two major datasets for the purposes of their analysis. They describe these datasets and the steps that they took to prepare the data for analysis in detail elsewhere (Ryo & Peacock, 2018). The primary dataset comes from records that ICE provided to the Transactional Records Access Clearinghouse pursuant to the Freedom of Information Act. This dataset consists of individual-level longitudinal information on each noncitizen detained by ICE during fiscal year 2015 (Detention Data). For each detainee in the Detention Data, ICE generated a new record each time the detainee was booked into a facility. Some detainees were booked in and out of multiple facilities during their detention, leading to multiple records.
To be included in the Detention Data, the individual must have been detained at some point during fiscal year 2015, but his or her detention need not have begun nor ended in fiscal year 2015. For individuals who entered detention before fiscal year 2015, some of their records in the Detention Data predate fiscal year 2015. For individuals whose detention continued beyond fiscal year 2015, they do not observe what happened to them and their records are right censored. All of the detainees in this study were released in fiscal year 2015 pending the completion of their removal proceedings, which means that they have their complete set of records. ICE’s recorded release reasons for these detainees are “Alternatives to Detention,” “Bonded Out,” “Order of Recognizance,” and “Order of Supervision.”
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