Originally Posted by Boggie Dog

I have witnessed a screener taking a swab that was lying on the table where the ETD was located then using that swap to test an item. No idea how long it had been laying on top of the table or how many testing cycles it had been through.

The only 100% way to use a ETD swab would be to remove it from the storage container, test the new swab before use, swab the item, then test for contamination.

Even then the target envelope is too wide to render useful results.