From CQ.com’s story about the remote-control toy ban:
TSA is attempting to move away from simply running down a checklist of permissible and banned items, and more toward a security posture that gives transportation security officers more discretion to make judgement calls at security checkpoints, she added. Taking this approach allows TSA’s security personnel more flexibility when scanning for ever-evolving terrorist threats.
“If we just take the approach of banning everything that we think could be a problem, then we would be left with people without carry-ons,” Howe said. “So the idea is to share the information with the workforce and the public and just let people know that it is something that we are concerned about.”