### Question
How does the law define perimeter security?


### Answer
Under *49 U.S.C. § 44946*, **perimeter security** is defined as:

> procedures or systems to monitor, secure, and prevent unauthorized access to an airport, including its airfield and terminal

#### Citation:
  - *49 U.S.C. § 44946*
  - Heading: **SUBTITLE VII-AVIATION PROGRAMS > PART A-AIR COMMERCE AND SAFETY > subpart iii-safety > CHAPTER 449-SECURITY > SUBCHAPTER II-ADMINISTRATION AND PERSONNEL**

