Skip CT for Head Injuries?

Well of course but not for the reasons listed. You use one of the simpler objective tests like one of these 17 ways.
http://newsroom.acep.org/2013-10-14-Nations-Emergency-Physicians-Announce-List-of-Tests-and-Procedures-To-Question-As-Part-of-Choosing-Wisely-Campaign
Avoid computed tomography (CT) scans of the head in emergency department patients with minor head injury who are at low risk based on validated decision rules.  Minor head injury is a common reason for visiting an emergency department.  The majority of minor head injuries do not lead to skull fractures or bleeding in the brain — which would need to be diagnosed by a CT scan.