We have almost got this drafted to skit level for a Saturday Nite Live presentation. Arab dressed with his head stuff walks into a doctors office carrying his AK and his IED- asks doctor if he will please implant the device up his arse. Doctor is a little hesitant breaded weirdo brandishes the AK dr says OK. You can finish up what the dr does while the dude is under as he does the implant
Why do you think the article mentions the concept is being tested with Dogs?...precisely to insure it is not detected.
The residue will not remain on the body forever. There would be tons of false positives if it did.
Every great improvement in detection will be met by someone trying to remain undetected, looking for techniques to outsmart the new technology. That's the way the world of good and evil works.
Will this technique succeed? It's yet to be determined.
We can either embrace the concept that evil is trying to stay one step ahead and then adjust to keep up with the challenges or dismiss them and fall behind the curve.