Historical textIn force on Oct. 1, 2010Source: annual CFR editions 2008–2016
§ 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Wording in the annual edition revised as of Oct. 1, 2008, superseded May 2, 2023.
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2010 edition's wording. An amendment that took effect between Oct. 1, 2010 and Oct. 1, 2010 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
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 October 1, 2010. This wording effective October 1, 2008 to May 2, 2023. Source: govinfo, 2010 edition, https://www.govinfo.gov/app/details/CFR-2010-title49-vol1/CFR-2010-title49-vol1-sec40-181. Retrieved from FMCSR.com, https://fmcsr.com/reg/40.181?asof=2010-10-01, 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- [88 FR 27646, May 2, 2023]
- [73 FR 35973, June 25, 2008]
- [73 FR 35973, June 25, 2008]
- 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.