looks like this won't affect Michigan (and potentially other States):
Enacted after 9/11, Michigan Aeronautics Code section 259.80f made it a misdemeanor, punishable by up to one-year imprisonment or a $1,000 fine, to "possess, carry, or attempt to possess or carry" any of a series of prohibited items "in a sterile area of a commercial airport." The list numbers firearms, explosives, and a "knife with a blade of any length."
That would include a pocketknife. So does Michigan's law trump the TSA rule change?
"That's the attorney general's position," said Joy Yearout, spokeswoman for Michigan attorney general Bill Schuette. "The state law remains in effect."
The TSA also confirmed Michigan law still applies. “It remains the responsibility of passengers to comply with state and local laws for each point of travel and be aware that origination and destination cities may have local laws prohibiting the possession of these items,” said TSA spokesperson David Castelveter.
Detroit Metropolitan Airport spokesperson Scott Wintner says Airport Authority Police officers will enforce the Michigan law "when violations come to their attention."
The Michigan wrinkle comes from a carve out in the TSA rules that defers to the states when it comes to defining their individual list of prohibited items.
http://www.nbcnews.com/travel/travelkit/how-michigan-hockeysticks-could-throw-wrench-tsas-new-pocketknife-rules-1C8775299