A former San Diego County sheriff's captain pleaded guilty Tuesday to running a longstanding illegal arms trafficking operation, in which he bought and resold guns available only to law enforcement for both financial and professional gain.

Marco Garmo, 52, the former captain of the sheriff's Rancho San Diego station, illegally purchased and resold "off roster'' firearms, which may be purchased by members of law enforcement, but not the general public, according to the U.S. Attorney's Office.

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