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OAKLAND – An attorney for one of three former Oakland police officers on trial for criminal misconduct began his attempt Tuesday to chip away at the credibility of a key prosecution witness in Alameda County Superior Court. 

The witness, former rookie Oakland Police Officer Keith Batt, spent his third day on the stand. Deputy District Attorney David Hollister used two full days last week in his direct examination of Batt and wrapped up his questioning this morning. 

In what is referred to as the “Riders” case, Clarence “Chuck” Mabanag, 37, Matthew Hornung, 30, and Jude Siapno, 34, are charged with filing false police reports and conspiring to hide their misdeeds, including alleged beatings.