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Big win in court this week for Jon Jones ... the UFC star's leaving the scene of an accident charge was dismissed.

Records, obtained by TMZ Sports , show New Mexico prosecutors on Wednesday dropped the misdemeanor count Jones had been facing stemming from a February car crash. Play video content

It's unclear why the matter was dismissed ... we've reached out to Bernalillo County officials for comment, but so far, no word back yet.

Jones was first hit with the charge in June, after law enforcement alleged he bolted from the scene of a wreck on Feb. 21 in Albuquerque.

Cops wrote in court docs that while they were investigating a traffic accident, they discovered a woman in the passenger seat of a vehicle who had been "exhibiting signs of significant intoxication and lacking

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