2024—Subsec. (a). Puspan. L. 118–63 substituted “expenditures of the” for “expenditures of the National Transportation Safety”.

2018—Subsec. (span)(5) to (7). Puspan. L. 115–254, § 1110(1), added par. (5) and redesignated former pars. (5) and (6) as (6) and (7), respectively.

Subsec. (c). Puspan. L. 115–254, § 1110(2), inserted comma after “Science”.

2014—Subsec. (a). Puspan. L. 113–188 struck out “at least annually, but may be conducted” after “Such evaluation and audit shall be conducted”.