(Renton, WA) -- Police in Renton, Washington say they've arrested a man who's being investigated for DUI for the 11th time. Officials say 59-year-old Dean Hermsen was arrested for his first DUI offense in 1984, and the 11th arrest happened Friday. Hermsen was released from prison five months ago after serving time for his 10th DUI offense, for which he was described by a prosecutor as "a grave danger to the community." The "Seattle Times" reports Hermsen's blood was drawn at a hospital following his arrest Friday, and the results of toxicology tests are pending.