OAKLAND, Calif. -- At the high point of their careers, the so-called "Riders" were considered the best and the brightest, veterans whom rookie police officers tried to emulate. Their specialty: bringing in reputed drug dealers in record numbers from the crime-plagued streets of West Oakland. Now, three of the four rogue officers are on trial here for using dishonest and sometimes brutal tactics in making those arrests. Clarence "Chuck" Mabanag, 37; Jude Siapno, 34; and Matthew Hornung, 31, are charged with a total of 26 criminal counts, including kidnapping, the beating of falsely arrested suspects, and submitting falsified police reports....