"Contrary to the myth of zero tolerance, most school board policies provide options and flexibility for administrators. What you see is poor decision-making and poor implementation of the policies, rather than the fact school administrators are handcuffed in terms of their discretion," he said.
Trump said most school officials bend over backwards to be fair. But he added there's no question that Sandy Hook weighs heavily.
"It's a normal occurrence to have a heightened sensitivity after a high-profile tragedy, but that does not negate the need for common sense," he said.
Maryland father Stephen Grafton said common sense was in short supply in a case involving his 6-year-old son, who he said was suspended from White Marsh Elementary School in Trappe, along with a second 6-year-old, for using their hands as "guns" during recess.
Grafton, a staff sergeant in the Army's 82nd Airborne Division, said administrators were criminalizing play. He said he told his son he shouldn't shoot pretend guns because it makes some children upset, "but it was a difficult conversation to have because he didn't do anything wrong."
The school lifted the suspension after a day and removed it from his record, Grafton said.
"It's a very hypersensitive time," he said. "But, still, common sense has to apply for something like this, and it looks like common sense just went completely out the window."
The school principal did not respond to messages.
Zero tolerance traces its philosophical roots to the "broken windows" theory of policing, which argues that if petty crime is held in check, more serious crime and disorder are prevented. So it's no accident that students are often harshly punished over relatively minor misbehavior, said Russell Skiba, a zero tolerance expert at Indiana University's Center for Evaluation and Education Policy.