A decades-old report of a Nicolet High School teacher’s assault of a student has that school system changing some of its policies.  Officials are looking for additional victims of former teacher David Johnson.  Glendale Police say the statute of limitations has expired, so Johnson can’t be prosecuted.  He taught at the high school from 1958 to 1991.  The district is making the changes to prevent the potential for future cases of abuse.  No police reports have been found.  It is possible at least one more student was abused by the teacher.