By TRIPP FROHLICHSTEIN / This is the story of a good idea gone bad. It is the story of a series of mistakes made by a television station. And it is the story of lessons learned by a school district. On Jan. 16, KSDK Channel 5 (the NBC affiliate in St. Louis) was investigating security at five different schools in the area. One of those schools was Kirkwood High School. The station’s undercover effort would result in a lockdown at the high school, angering students, staff and parents and ultimately forcing an apology from the station. The details of this story are pieced together from interviews and previous accounts; Channel 5 officials, when asked for an interview, said the station had no further comment.