### Question
How is the "security background check" defined?


### Answer
The term **security background check** is defined in *6 U.S.C. § 1170* as follows -

> reviewing, for the purpose of identifying individuals who may pose a threat to transportation security or national security, or of terrorism—


(A) relevant criminal history databases

#### Citation:
  - *6 U.S.C. § 1170*
  - Heading: **CHAPTER 4-TRANSPORTATION SECURITY > SUBCHAPTER IV-SURFACE TRANSPORTATION SECURITY > Part B-Railroad Security**

