The sheriff’s office recently proposed limiting all mail sent to inmates to postcards instead of the envelope-enclosed letters currently allowed. Sorting through the 200,000 letters a year is tedious, jail officials say. Some of the letters are soaked, spliced or stamped with drugs: PCP, acid, meth and other contraband. Some contain needles. Some hide gang communications. The idea of switching to simply postcards—outside of inmates’ communications with their attorneys—would save money and time. But families and friends of inmates, as well as community activists, argue that the change would constitute a civil rights violation and endanger the rehabilitation of those incarcerated.