Prosecutors tell TMZ Sports they believe Aldon Smith was driving with a BAC of greater than .20 before he was arrested for a DUI earlier this month.
Smith was booked back on Dec. 6 after cops say he had driven drunk in San Mateo County and then got involved in a two-car accident -- and, on Monday, prosecutors formally filed charges against the 32-year-old over it all.
In the docs, prosecutors say Smith had a BAC of greater than .15 ... and when we spoke with the San Mateo County District Attorneys Office on Monday afternoon, a spokesperson told us they believe Smith actually had a BAC of greater than .20.
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