Well, I'm not as familiar with the meat antibiotic detection, but I know that in milk you test every truck before it's unloaded. You will have a test, and if you've found any positive tests on any source—so there are no false positives or negatives—it's going to be retested and confirmed, and then each of the samples of the farmers will be retested, and not only will the truck be destroyed but the farmers will be charged with the destruction of that milk. You're talking about some trucks at $70,000 a shot. There is no incentive for farmers, knowing that it's all going to be tested, to do it. Unfortunately it does happen on a rare occasion, and it's often a new employee who didn't tag the animal properly and milked them all.
So it happens, you know. To go back to some of the comments made before, these things will happen, but the system has to pick them up. Errors will continue to happen, but you need to be able to pick them up. Consumer safety, in the end, is really what you're aiming for.