[Ed. – Yes, this is an actual thing. Nothing like having this stuff quantified.]
One of the Department of Homeland Security’s fiscal 2016 goals is for U.S. Customs and Border Protection (CBP) to either apprehend or turn back 81 percent of the persons it detects illegally entering the United States between the ports of entry on the U.S.-Mexico border.
If DHS were to meet that goal, 19 percent of the individuals CBP detects illegally entering the United States across the southwest border would evade apprehension and would not be turned back into Mexico.
An appendix to the “U.S. Department of Homeland Security Annual Performance Report” refers to such individuals as “gotaways.”
Last year, in fiscal 2015, according to the report, 81.01 percent of the “illegal entrants” CBP detected crossing the southwest border into the United States between the ports of entry were apprehended or turned back.
18.99 percent got away.