Sisters and Brothers,   Tomorrow, the L.A . County Board of Supervisors will vote on Agenda Item #12 , a proposal that directly impacts our rights as probation-peace officers.   These changes are sweeping and serious. Among other things, they would:   Allow discipline to be based entirely on hearsay Double probationary periods from 12 to 24 months Double unpaid suspension time from 30 to 60 days Allow unpaid suspensions based solely on an accusation Limit your ability to cha