A friend of mine was called for jury duty during the trial for the Concordia University professor who went nuts and killed four people (my friend did not know this was what he was called for). The killer, Vallery Fabrikant, eventually decided to defend himself in court, and the trial dragged on for months.
My friend worked for a local radio station at the time, and had the presence of mind to wear a jacket bearing the call letters. He was asked if he worked at the station, answered yes, and was excused.
He was retained that day for duty on another trial (far less media-sensitive)and served that day. The trial lasted about an hour or so, deliberation lasted something like five minutes, and he was out.