Douglas Horngrad told the San Francisco Chronicle that Alameda County prosecutors have declined to file charges against his client, 49-year-old Geoffrey McGann of Rancho Palos Verdes, Calif.
McGann was arrested after he put his watch through an X-ray scanning machine at Oakland County Airport.
In addition to the watch, McGann was wearing a shirt with built-in tourniquets and oversize UGG boots that had hollow compartments in the soles to make him look taller, authorities said.
"Just because someone can make an artsy watch which looks like a timing switch for an IED, doesn't mean it's smart or logical to try to bring it on a plane," said Sgt. J.D. Nelson of the Alameda County Sheriff's Department.
McGann is a prominent advertising writer and executive who gained fame creating ads for Nike, Subaru and other companies.