49 CFR §1544.228

1. (a)Before an aircraft operator authorizes and before an individual performs a function described in paragraph (b) of this section—
   1. (1)Each individual must successfully complete a security threat assessment or comparable security threat assessment described in part 1540 subpart C of this chapter; and
   2. (2)Each aircraft operator must complete the requirements in part 1540 subpart C.
2. (b)The security threat assessment required in paragraph (a) of this section applies to the following:
   1. (1)Each individual who has unescorted access to cargo and access to information that such cargo will be transported on a passenger aircraft; or who has unescorted access to cargo that has been screened for transport on a passenger aircraft; or who performs certain functions related to the transportation, dispatch, or security of cargo for transport on a passenger aircraft or all-cargo aircraft, as specified in the aircraft operator's security program; from the time—
      1. (i)The cargo reaches a location where an aircraft operator with a full all-cargo program consolidates or inspects it pursuant to security program requirements until the cargo enters an airport Security Identification Display Area or is transferred to another TSA-regulated aircraft operator, foreign air carrier, or indirect air carrier; or
      2. (ii)An aircraft operator with a full program accepts the cargo until the cargo—
         1. (A)Enters an airport Security Identification Display Area;
         2. (B)Is removed from the destination airport; or
         3. (C)Is transferred to another TSA-regulated aircraft operator, foreign air carrier, or indirect air carrier.
   2. (2)Each individual the aircraft operator authorizes to screen cargo or to supervise the screening of cargo under § 1544.205.