I am no expert, but the people I know who have gotten DUIs have kept their license until their trial.
I have a friend who was pulled over for DUI right before xmas and she only lost her license because she refused a breathalyzer (she said she wasn't drunk, I said why would you refuse a breathalyzer if not drunk?) Her arraignment was a few weeks ago, the trial is in Sept. I think she loses her license at least till then, and that the administrative suspension for refusal to submit is completely separate from any criminal suspension she might get at the trial (she's in MA.)
I think it is refusing the breathalyzer. I know in VA if you refuse it you lose your license for 6 months no matter what. If you take it and fail they have you for DUI and you will lose your license anyway eventually, and obviously you are going to jail that night so you won't be able to drive again until you are sober anyway. I could be wrong but I think that is how it works here.
edit: I was just thinking about this and I actually don't think they always take your license for a DUI. I think for first offenses sometimes it just gets restricted so you can drive to and from work and or school, but you have to keep a copy of your schedule with you in case you get pulled over. I am amazed by all the big red Rs on licenses when I card people in our bar.
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