An amputee does not have to go it alone in a lawsuit alleging the Cook County Jail’s toilet and shower facilities do not meet federal disability requirements.In a written opinion last week, U.S. District Judge John Robert Blakey certified a class in the suit Preston Bennett filed on behalf of certain inmates housed in Division 10 of the jail. Most inmates with physical disabilities are housed there.Bennett maintains Sheriff Thomas J. Dart is violating the structural standards mandated by the Americans with Disability Act …