Witnesses tell police a 16-year-old student at Madison West High School was “waving a taser around” and shouting obscenities Wednesday afternoon.  Police were called to the school at about 2:00 P-M, they took the student into custody.  The teenager tried to run away when officers approached, but he was caught after a brief foot chase.  He faces charges of possession of a dangerous weapon on school property, disorderly conduct, carrying a concealed weapon and resisting.  Nobody was injured during the disruption.  The suspect was taken to the Dane County Juvenile Reception Center.  His name won’t be released due to his age.