STOCKTON (CBS13) — CHP arrested a driver today in Stockton on Friday with a frightening blood-alcohol level.

They say it happened after the driver hit a mailbox. Citizens nearby reportedly detained the driver until officers arrived.

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The driver later blew a .399% on a breathalyzer machine.

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In California, a person can receive a DUI for having .08% blood alcohol concentration.

Once blood alcohol levels reach more than .4%, there is a strong possibility of either immediate death or falling into a coma.

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Fortunately, the driver is safe in police custody.