Law enforcement sources tell us Pressly blew the .22 in the field. That's nearly three times the legal limit of .08.
As TMZ first reported, Pressly was arrested at around 11 p.m. last Wednesday in Santa Monica, Calif. after cops stopped her on a traffic violation.
Pressly was booked on suspicion of DUI and was released on $15,000 bail.
Pressly is best known for her starring role in 'My Name I Earl.'