Teacher taught students how to make bombs

A 42-year-old Freedom High School chemistry teacher was arrested Monday after students told authorities he taught his class how to make explosives, the Orange County Sheriff's Office said.

David Pieski, a teacher at Freedom for two years, used an overhead projector in class to give students detailed instructions in bomb-making, including advising them to use an electric detonator to stay clear from the blast, according to an arrest report.

On Feb. 8, sheriff's investigators interviewed Pieski at the school. He told investigators he detonated chemicals in a coffee can by a ball field four times for his students. He said he did this as a chemistry project to show a reaction rate, the arrest report said.

He was arrested at Cunningham's office Tuesday morning on a charge of possession or discharging of a destructive device and culpable negligence.