OAKLAND (CBS/AP) — An audit shows Oakland is keeping cash from overpaid parking tickets despite a state law requiring refunds.

Motorists mistakenly paid parking tickets twice, adding to a $316,000 windfall last year alone.

READ MORE: Richmond Police K-9 Helps Detain, Disarm Machete-Wielding Suspect Threatening Family

The city auditor said Oakland’s parking enforcement officers issued $22.7 million in tickets last year.

The $316,000 in overpayments came from inattentive motorists who paid twice.

READ MORE: Condemnation of the Unvaxxed Grows as Bay Area Mask Mandates Reappear

The annual windfall was discovered as part of a larger audit of the city’s parking ticket management.

The auditor said Oakland bureaucrats have no knowledge of the requirement to reimburse overpayments.

MORE NEWS: San Jose Unified Schools Set to Reopen for Full In-Class Learning

(Copyright 2012 by CBS San Francisco. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)