(Hillsboro, OR) -- Twenty cases in Washington County involving parents or caregivers of children exposing kids to illegal drugs are being dropped. Washington County District Attorney Kevin Barton says a ruling in State V. Stevens has been upheld by the Oregon Court of Appeals. A caregiver exposed an 18-month-old to methamphetamine, and the drug was found in the child's system. The court ruled the person could not be convicted of Criminal Mistreatment in the First Degree. Barton says it will make it more difficult to hold parents and caregivers who use drugs with children around accountable.