§FMCSR.com
Current textSource: eCFR

§ 40.181 What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?

Current wording, effective June 1, 2023.

eCFR (current) ↗
What changedOct. 1, 2008 wording → June 1, 2023 wording (current)+8 added−9 removedHide

As the laboratory testing thea urine split specimen, you must test the split specimen using the confirmatory tests for creatinine and specific gravity, and using the confirmatory criteria set forth in § 40.93(b)88.
[7388 FR 3597327646, JuneMay 252, 20082023]

49 CFR § 40.181 — What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?. Text current through October 22, 2026. This wording effective June 1, 2023 to present. Source: eCFR (current), https://www.ecfr.gov/current/title-49/section-40.181. Retrieved from FMCSR.com, https://fmcsr.com/reg/40.181, on October 26, 2026. Unofficial compilation; verify against the official source.

As the laboratory testing a urine split specimen, you must test the split specimen using the confirmatory tests for creatinine and specific gravity, using the criteria set forth in § 40.88.

[88 FR 27646, May 2, 2023]

Amendment history

4 distinct wordings on file since Oct. 1, 2001
  1. June 1, 2023 → presenteCFR, day-precisediff vs. previousviewing
    [88 FR 27646, May 2, 2023]
  2. May 2, 2023 → June 1, 2023eCFR, day-precisediff vs. previous
    [73 FR 35973, June 25, 2008]
  3. Oct. 1, 2008 → May 2, 2023annual editions 2008–2016diff vs. previous
    [73 FR 35973, June 25, 2008]
  4. Oct. 1, 2001 → Oct. 1, 2008annual editions 2001–2007

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section. Set a case date in the header to read any earlier wording.