According to this article on German news site Nachrichten, as un-ablauted by Google Translate and turned into a slurry of humorous pidgin gobbledygook, a quantity of bacon is enough to set off hand luggage bomb detectors.
Apparently, the traveler — on his way to America through Linz — was stopped going through after a machine detected that a piece of bacon his wife had packed "had a similar molecular density to certain types of explosives."
Confronted with an X-Ray of the bacon and asked to identify it, the nervous passenger replied: "It's fat." In America, such flip would earn you a solid truncheoning, but the passenger was merely requested to open the package in a bomb-proof room and prove that it actually was bacon. Humorously, the traveler apparently seemed worried that the bacon might actually be an explosive, as it was packed for him as a lunch by his wife, whom he was on the outs with.
What happened to the traveler? The Nachrichten piece ends surrealistically:, ranting and raving about the Virgin Mary wanting to fly to Rome. It remains unclear at this time whether the bacon incident delayed the Holy Mother's pilgrimage, or whether the bacon was confiscated by customs officials for "disposal."
Bacon in suitcase triggers bomb alarm [Nachrichten via Google Translate]