The attorney for a family suing Chicago Public Schools over the alleged handcuffing of a first-grader in 2010 said Tuesday that the boy was among several 6- and 7-year-olds who were detained and handcuffed for hours for talking in class, reports the Chicago Tribune. In an email to the Tribune, attorney Michael Carin said school officials at Carver Primary School on the Far South Side authorized the on-campus security guard in March 2010 to discipline some first-graders who were being disruptive…