2018—Subsec. (a). Pub. L. 115–254, § 244(1), substituted “Subject to subsection (c)” for “Subject to subsection (b)” in introductory provisions.

Subsecs. (b) to (d). Pub. L. 115–254, § 244(2), (3), added subsec. (b) and redesignated former subsecs. (b) and (c) as (c) and (d), respectively.