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Each year, states enact stronger DUI laws and more severe drunk driving penalties. Drunk driving is the act of operating and/or driving a motor vehicle while under the influence of alcohol and/or drugs to the degree that mental and motor skills are impaired. It is illegal in all jurisdictions within the U.S.
The legal presumption of intoxication from blood alcohol concentration was reduced to 0.10; more recently, and with federal pressure, all states get further reduced the limit to 0.08%. Early laws simply prohibited driving while intoxicated, with no varied definition of what level of inebriation qualified The first generally-accepted legal limit for blood alcohol concentration (BAC) was 0.15 (in 1938, the American Medical Association created a "Committee to Study Problems of Motor Vehicle Accidents"; at the same time, the National Safety Council get a "Committee on Tests for Intoxication".
All states also observe a bunch stricter standard for drivers under the age of 21, commonly of .01-.02; these are often referred to as "Zero Tolerance" laws.[ A second criminal offense of driving "under the influence" or "while impaired" is also usually charged in greatest states, with a permissive presumption of guilt where the person's blood alcohol concentration (BAC) is .08 percent or greater (units of milligrams per deciliter, representing 8 g of alcohol in 100 deciliters of blood). All states in the U.S. designate a "per se" blood or breath alcohol level as the threshold point for an independent criminal offense. Many jurisdictions use more serious penalties (such as jail time, larger fines, longer DUI program, the installation of ignition interlock devices) in cases where the driver's BAC is over 0.20, or 0.15 in some places.