|People at the scene were reportedly told, "It's just a drill."|
I think the more likely explanation is that the explosives weren't in anything the dogs were asked to sniff.
|He sniffs one package at a time.|
This works pretty well if you have pile of luggage to inspect or a line of people waiting at a security checkpoint.
|He is unlikely to miss a bomb in this situation.|
|He was the inspiration for using Vapor Wake dogs in L.A.|
What he found is the newest generation of explosives sniffing dogs--"vapor wake" dogs developed at Auburn University's College of Veterinary Medicine.
|Chaci has followed the "vapor trail" to the explosives.|
They might well have made a difference.
good informational video: http://www.cbsnews.com/8301-505263_162-57355810/the-new-pack-of-bomb-sniffing-dogs/