How is a blood alchol level determined?

Blood alcohol level is determined by measuring the concentration of ethanol in the bloodstream, typically expressed as a percentage. This can be done through various methods, including breath tests, which estimate blood alcohol content (BAC) based on the amount of alcohol exhaled, or through blood tests that directly analyze a blood sample for ethanol concentration. Additionally, urine tests can also be used, although they may not provide as accurate a measure of current impairment. The level indicates the degree of intoxication and can have legal implications in contexts such as driving under the influence.