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Information on the activation date of the Secure Communities program in each county comes from publicly available reports published by DHS. We supplement this information with records on ICE detainer requests and removals from the Transactional Records Access Clearinghouse (TRAC) at Syracuse University. Detainer data provide information on all ICE detainer requests from 2002–2015, including whether a detainer was “honored” (i.e., whether an individual was “booked into detention” by ICE). Unlike the information about detainers, removals data only pertain to removals that occurred as a result of the SC program and is thus only available post-treatment.
We aggregate these data sources to construct measures of the number of overall detainer
requests, the number of honored detainers, and the number of SC removals at the county × year × month level. Our preferred measure of enforcement intensity is honored detainers because it is available both before and after treatment and is
more closely linked to deportation actions, as it only includes individuals who were transferred to ICE custody.....[citing TRAC data and reports]
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