Public Defender Steve Carroll said Tuesday that Oceanside Officer Damon Smith taped interviews for eight years but never turned them in as evidence.
Defense attorneys were unaware of the tapes' existence until they were notified earlier this month by the district attorney's office.
The tapes came to light in April when Smith was testifying in a domestic violence case.
Carroll says Smith's motive is unclear. A police spokesman did not immediately return a call.
District attorney spokesman Paul Levikow says it's too early to comment on the probe.
The discovery was originally reported by the North County Times.
Copyright 2009 The Associated Press.
Evacuation orders were lifted Monday for people affected by the Gate Fire - which is now 95 percent contained.
The group behind the proposed SoccerCity development collected enough valid petition signatures to require the San Diego City Council to either consider approving the Mission Hills project or placing it before voters, the city clerk reported Monday.
Winter weather helped bring California out of a drought, but it also created the perfect environment for a wildlife to thrive. News 8's Brandon Lewis reports on some of the species taking over the mountains in San Diego.
It was the discovery of a lifetime for two local men who stumbled across a 1920's Model T left behind in a barn.
All beaches remain close in San Clemente Monday after more than two dozen sharks were spotted swimming close to shore. It's just the latest of several sightings in recent weeks. News 8's Heather Hope reports from John Wayne Airport in Orange County.
A local non-profit is working to improve ovarian cancer survival rates by guiding patients into a new frontier.
Voters may have the opportunity to decide on the future of San Diego's hotel tax. The city council Monday discussed whether Mayor Faulconer's proposed measure should appear on the ballot in a special election in November.
The Gate Fire, which has burned about 2,056 acres northwest of Dulzura, was 95 percent contained Monday. Cal Fire also reported that all evacuation orders and warnings were lifted in the fire area.
A Columbian artist born with no arms or legs is proving she is stronger than life's biggest challenges.
A brush fire blackened about 10 acres Monday in an open-space preserve near Cowles Mountain, spreading toward some homes but causing no reported structural damage or injuries.