“Some of the detection technology employed by the CBSA includes ion mobility spectrometry, x-rays and Narcotic Identification Kits. These tools, in combination with the officer’s knowledge, experience, training, enable successful enforcement actions.”
In other words, they found it by pure luck.
<man steps up to the security checkpoint and removes his belt and shoes, walks through>
“Hey, wait a minute! My shoes used to have my feet in them! Why are they full of drugs when coming out of the scanner???”