"The September 11 terrorist attacks and continued threats of future attacks have directed Congress's attention to U.S.-Canada border security-related issues. Both countries are striving to balance adequate border security with other issues such as the facilitation of legitimate cross-border travel and commerce, and protecting civil liberties. Congress has taken action (the USA PATRIOT Act, P.L. 107-56; and the Enhanced Border Security and Visa Entry Reform Act of 2002, P.L. 107-173) to increase the number of INS [Immigration and Naturalization Service] border patrol agents and inspectors at northern ports of entry and to provide these officials with additional technologically upgraded equipment."
CRS Report for Congress, RS21258