§FMCSR.com
Historical textIn force on April 2, 2021Source: eCFR

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

Wording in the annual edition revised as of Oct. 1, 2008, superseded May 2, 2023.

eCFR as of April 2, 2021 ↗
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 in force on April 2, 2021. This wording effective October 1, 2008 to May 2, 2023. Source: eCFR as of April 2, 2021, https://www.ecfr.gov/on/2021-04-02/title-49/section-40.181. Retrieved from FMCSR.com, https://fmcsr.com/reg/40.181?asof=2021-04-02, on October 26, 2026. Unofficial compilation; verify against the official source.

As the laboratory testing the 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).

[73 FR 35973, June 25, 2008]

Amendment history

4 distinct wordings on file since Oct. 1, 2001
  1. June 1, 2023 → presenteCFR, day-precisediff vs. previous
    [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. previousviewing
    [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.