The researchers showed how to get round the limited computational abilities of the smart tags to use them as an attack vector and corrupt databases holding information about what a company has in storage.
Organizers have been holding regular meetings with the authorities since the Boston attack, and extra police will be visible along the 26.2-mile course.
The Syrian-backed Hezbollah militant group -- which operates out of Lebanon -- is still holding two Israeli soldiers it captured in July 2006 after an attack along Israel's border with Lebanon.
In the short term at least it means that McCarty will adopt more of a holding role in front of the defenders, despite his natural inclination to attack.
Tomic's lawyer Carmen Dieguez said the reason that he used his head to attack Drouet was because the tennis player, 29, was holding the coach's arms at the time and that he was acting in self-defence.