### Question
How does the law define unlawful border crossing effectiveness rate?


### Answer
Under *6 U.S.C. § 223*, **unlawful border crossing effectiveness rate** is defined as:

> the percentage that results from dividing the number of apprehensions and turn backs by the sum of the number of apprehensions, estimated undetected unlawful entries, turn backs, and got aways

#### Citation:
  - *6 U.S.C. § 223*
  - Heading: **CHAPTER 1-HOMELAND SECURITY ORGANIZATION > SUBCHAPTER IV-BORDER, MARITIME, AND TRANSPORTATION SECURITY > Part B-U.S. Customs and Border Protection**

