If no collission/injury and this was a first, second or third offense - as in, it is only a misdemeanor, the statute of limitations is 1 year from arrest. Good luck!
Keep an eye on your mail though. The DA, potentially even Police Department, may send something over your way with a new appearance date.
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Typically they have up to a year to file. I would make sure that your address is current with the Department of Motor Vehicles. It's not clear if the case is a 'prosecution reject' or a 'no-file.' It's possible they are waiting for blood results or some other piece of information to see if they are going to proceed. This is a no-file situation. If they have reviewed everything and have decided that they aren't going forward at all then this would be a 'prosecution reject.' You could consult with a local attorney who can keep on top of the situation to make sure that if they do file it doesn't fall through the cracks. Good luck.
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The statute of limitations on a misdemeanor DUI is 1 year. In some instances the DA is just not ready to file charges. The "declining to file charges at this time" is some indication that this may be the case.
SOL in California is one year for misdemeanors after the date of offense.
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If they haven't filed charges yet, there is a good chance that they will decline entirely.
However, as my colleagues have said, the statute of limitations is one year.