At your link, on the right is a link to "Naval Base Locked Down".
in it, the briefcase is what alerted the dogs.
The earlier story said "the truck cab".
We think we are jumping at shadows.
But at the Navy Base, a dog went to 'alert mode' and the base was locked down for 3 hours.
There was an explosive "alert" also to the truck stopped in Washington State by the naval base.
Monday, May 13, 2002
By Carl Cameron
A Budget truck was pulled over in Oak Harbor, Wash., last Tuesday near the Whidbey Island Naval Air Station and found to have traces of TNT on the gearshift and traces of RDX plastic explosive on the steering wheel, Fox News has learned.
http://www.foxnews.com/story/0,2933,52681,00.html