WASHINGTON– Mark John Walker, 52, of Eugene, Ore., pleaded guilty today to charges related to his engaging in sexual contact or aggravated sexual abuse with female offenders who were under his direct supervision as a federal probation officer from 2006 to 2009. Sentencing is scheduled for July 18, 2011 before Chief U.S. District Judge Ralph R. Beistline, who is a visiting judge from Alaska. As a U.S. Probation Officer, Walker supervised offenders who were serving probation or supervised release terms imposed by a federal judge, including offenders with vulnerable backgrounds involving sexual abuse, mental illness and drug addiction. Walker had the power to recommend that offenders who violated their conditions of probation or supervised release be incarcerated or otherwise sanctioned. Under the U.S. Constitution and federal law, law enforcement officials cannot use their authority to willfully sexually assault individuals under their control. While exercising his authority as a ...