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To examine the underlying heterogeneity present in 287(g) agreements, I use a dataset from ICE.
This dataset derives from the Transactional Records Access Clearinghouse (TRAC), a data research organization, and was obtained from ICE using the Freedom of Information Act (FOIA). The data contain individual records on each
recorded I-247 detainer or notice request prepared by ICE, including the month and year when ICE prepared the I-247 form, the state, county-facility detainer sent, whether the detention facility was federal, state, or county, and whether ICE assumed custody after the detainer was issued. For each detainer, the data contain
both information on the agency that sent the request and demographic information, such as country of citizenship for each individual. The data also contain the individual’s criminal history, categorized by both the most serious criminal conviction and whether that conviction falls under Level 1, Level 2, or Level 3 of the prioritization for 287(g) enforcement. TRAC used
ICE’s guidance to group recorded offense codes into these three categories.
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