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Ethanol is important both forensically ("drunk driving" or driving while under the influence, "DWI", regulations) and commercially (alcoholic beverages). Blood-and breath-alcohol testing can be imposed on individuals operating private vehicles such as cars, boats, or snowmobiles, or operators of commercial vehicles like trucks, planes, and ships. The various levels of blood alcohol that determine whether these operators are considered legally impaired vary depending on the circumstances, anddoi:10.1088/0026-1394/42/1a/08005 fatcat:qnisxuixgneppkmu2olyb7ujvy