Nothing in this article shall abrogate the authority of any public school district and its governing board to take such disciplinary action as it is otherwise empowered by law to take against any student for misconduct including, but not limited to, expulsion, and nothing in this chapter shall require that any student be assigned to such an alternative school. These decisions shall rest solely in the discretion of the district and school board, regardless of the offense, record of the child, or other information presented from any source.