There are several 'To Catch a Smuggler' shows. The detection seems to be done primarily by trained dogs and Xrays. Cartels might be interested in a workaround for those 2 challenges.

Unlike enzymatic formulas that work slowly and leave odors behind, Pooph dismantles odors on a molecular level to eliminate them at the source --turning any organic odor into clean fresh air. It's as if the odor was never there! And as powerful as it is Pooph is safe for people, pets, your home, and the planet.

That leaves X-ray detection unless a product is changed to be the same density and specific gravity as the medium it is inside. Instead of dense hard bricks, a foam version of the product could render it invisible.
They would have to trade more volume for the same old dense quantity
Shhh, don't tell the criminals.