Source: https://www.law.cornell.edu/uscode/text/18/3146
Timestamp: 2019-04-24 12:20:49+00:00

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if the person was released for appearance as a material witness, a fine under this chapter or imprisonment for not more than one year, or both.
A term of imprisonment imposed under this section shall be consecutive to the sentence of imprisonment for any other offense.
It is an affirmative defense to a prosecution under this section that uncontrollable circumstances prevented the person from appearing or surrendering, and that the person did not contribute to the creation of such circumstances in reckless disregard of the requirement to appear or surrender, and that the person appeared or surrendered as soon as such circumstances ceased to exist.
If a person fails to appear before a court as required, and the person executed an appearance bond pursuant to section 3142(b) of this title or is subject to the release condition set forth in clause (xi) or (xii) of section 3142(c)(1)(B) of this title, the judicial officer may, regardless of whether the person has been charged with an offense under this section, declare any property designated pursuant to that section to be forfeited to the United States.
A prior section 3146, added Pub. L. 89–465, § 3(a), June 22, 1966, 80 Stat. 214; amended Pub. L. 97–291, § 8, Oct. 12, 1982, 96 Stat. 1257, related to release in noncapital cases prior to trial, prior to repeal in the revision of this chapter by section 203(a) of Pub. L. 98–473.
Another prior section 3146, act Aug. 20, 1954, ch. 772, § 1, 68 Stat. 747, which prescribed penalties for jumping bail, was repealed by Pub. L. 89–465, § 3(a), June 22, 1966, 80 Stat. 214, and covered by former sections 3150 and 3151 of this title.
1996—Subsec. (b)(1)(A)(iv). Pub. L. 104–294 substituted “a fine under this title” for “a fined under this title”.
1994—Subsec. (b)(1)(A)(iv). Pub. L. 103–322 substituted “fined under this title” for “fine under this chapter”.
“(2) for appearance as a material witness, he shall be fined not more than $1,000 or imprisoned for not more than one year, or both.
Subsec. (c). Pub. L. 99–646, § 55(f)(2), substituted “requirement to appear” for “requirement that he appear” and “the person appeared” for “he appeared”.
Subsec. (d). Pub. L. 99–646, § 55(f)(3), inserted “of this title” after “3142(b)” and substituted “clause (xi) or (xii) of section 3142(c)(1)(B) of this title” for “section 3142(c)(2)(K) or (c)(2)(L)”.
Amendment by Pub. L. 99–646 effective 30 days after Nov. 10, 1986, see section 55(j) of Pub. L. 99–646, set out as a note under section 3141 of this title.

References: § 3
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 § 55
 § 55