California Highway Patrol Commissioner D.O. "Spike" Helmick, who has criticized fellow officers who too liberally used past injuries to beef up their retirement benefits, is seeking that type of lucrative pension himself. On Friday, neither Helmick nor the state retirement system would describe the injuries involved. But in workers' compensation cases Helmick filed during the past three years, the 59-year-old commissioner said he injured his back falling off his office chair and hurt his knee riding a stationary bike. The cases also cited the cumulative effects of traffic accidents and scuffles. The commissioner is seeking an industrial disability retirement after...