Editing Blood alcohol content (section)

=== By breathalyzer ===
[[File:Breathalyser 'pint' glass - 2023-03-27 - Andy Mabbett.jpg|thumb|upright|Joke "Breathalyser 'pint{{'"}} beer glass, about 2 inches tall, dating from around the time of the introduction of [[breathalyzer]]s in the United Kingdom, in 1967]]
{{Main|Breathalyzer}}
The amount of alcohol on the breath can be measured, without requiring drawing blood, by blowing into a [[breathalyzer]], resulting in a breath alcohol content (BrAC). The BrAC specifically correlates with the concentration of alcohol in arterial blood, satisfying the equation {{math|1=BAC<sub>arterial</sub> = BrAC × 2251 ± 46}}. Its correlation with the standard BAC found by drawing venous blood is less strong.<ref>{{cite journal |last1=Lindberg |first1=L. |last2=Brauer |first2=S. |last3=Wollmer |first3=P. |last4=Goldberg |first4=L. |last5=Jones |first5=A.W. |last6=Olsson |first6=S.G. |title=Breath alcohol concentration determined with a new analyzer using free exhalation predicts almost precisely the arterial blood alcohol concentration |journal=Forensic Science International |date=May 2007 |volume=168 |issue=2–3 |pages=200–207 |doi=10.1016/j.forsciint.2006.07.018|pmid=16978819 }}</ref> Jurisdictions vary in the statutory conversion factor from BrAC to BAC, from 2000 to 2400. Many factors may affect the accuracy of a breathalyzer test,<ref>{{cite journal |last1=Jones |first1=AW |last2=Cowan |first2=JM |title=Reflections on variability in the blood-breath ratio of ethanol and its importance when evidential breath-alcohol instruments are used in law enforcement. |journal=Forensic Sciences Research |date=3 August 2020 |volume=5 |issue=4 |pages=300–308 |doi=10.1080/20961790.2020.1780720 |pmid=33457048|pmc=7782040 |doi-access=free }}</ref> but they are the most common method for measuring alcohol concentrations in most jurisdictions.<ref>{{cite journal |last1=Williams |first1=Paul M. |title=Current defence strategies in some contested drink-drive prosecutions: Is it now time for some additional statutory assumptions? |journal=Forensic Science International |date=1 December 2018 |volume=293 |pages=e5–e9 |doi=10.1016/j.forsciint.2018.09.030|pmid=30342920 |doi-access=free }}</ref>