Abstract
Five hundred million travelers enter the US yearly at a Port of Entry (POE) after an Immigration & Naturalization Service (INS) interview. We describe a general method for sampling from a flow, and summarize results from random reinspections of travelers at 20 POEs. Analyses reveal that 47 in 5614 travelers (0.8% ± 0.24%) were erroneously granted entry. Results suggest INS intercepts 9.3% to 16.0% of travelers attempting illegal entry at a POE, and that INS mistakenly admits 2.95 to 5.45 million illegal immigrants at POEs annually. Additional applications of our sampling method (e.g., for quality control, population studies) are briefly discussed.
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Morrel-Samuels, P. Measuring Illegal Immigration at US Border Stations by Sampling from a Flow of 500 Million Travelers. Population and Environment 23, 285–302 (2002). https://doi.org/10.1023/A:1013099629114
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DOI: https://doi.org/10.1023/A:1013099629114