Originally Posted by Bart

Using explosive detection machines as the routine detection technology is not a waste of money. Using explosive detection dogs to follow up on a package that alarmed the ETD (after ruling out other possibilities) is smart; however, it all depends on what's a reasonable time limit if the dog isn't immediately available. To say that there should be a dog at the checkpoint constantly may sound reasonable, but once again, dogs tend to get bored, distracted, moody, tired and restless.