Porn legend Asia Carrera was arrested Thursday in St. George, Utah for driving drunk with her daughter in the car ... and cops say her blood-alcohol level was MORE THAN DOUBLE the legal limit.
Cops reportedly received a call saying a woman was passed out on a couch in the Washington County School District building. Officers say they found Asia reeking of booze and she copped to driving beforehand with her daughter.
Asia -- real name Jessica Steinhauser -- took cops to her car, but reportedly attempted to leave during their talk ... so cops detained the former XXX actress for a field sobriety test.
Cops say the AVN Hall of Famer failed to pass -- and even fell during one walking attempt -- then blew a 0.254 and 0.202 BAC on two different machines ... well over the legal limit of .08.
Asia was booked for driving under the influence of alcohol with a minor and released the same day.
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