Originally Posted by
gsoltso
Cross contamination is probably something that happens, it would be impossible in a checkpoint setting to completely prevent it. We have training on it regularly to keep awareness up. The enviornment is probably responsible for some cross contamination as well, the air quality and dust levels in the checkpoints are miserable at most locations I have ever seen.
The swabs function just as they are designed, as a media to collect things, they are quite suited to that purpose.
The swabs may collect things well but the problem is those things in most cases are not dangerous, like Clear Care contact lens cleaner, my camera bag, and other such things.
TSA seems to have a habit of deploying systems that offer little security benefit.