(CBS4) COCONUT CREEK Investigators say Kevin Mair, 25, of Plantation walked into his classroom Friday morning at Atlantic Technical Center in Coconut Creek using a cane and wearing the types of headphones used in a gun range. Surveillance tape was released by the police showing the suspect approaching one person and that person doubling over. They say he became agitated and displeased about the lack of black history courses being taught. (February is Black History Month.) The teacher asked Mair to leave and called for staff assistance. Broward school spokesman, Keith Bromery, said the student – who is an adult...