It’s a waste of money. Put your finger in a hole in the dike while it crumbles away under your feet.
The marijuana market is so vast it is absolutely hopeless to try and track where it comes from as a method to try and stop the importation or movement.
If you slow production in one area it will simply pick up elsewhere.
But we’re so close to winning! If we only spend a couple billion more kicking in doors and jail a couple hundred thousand more dealers and users the entire drug trade will crumble!
/s
Using the same technology they use for bomb detection (isotopes) sites can be set up along major routes to detect vehicles carring drugs of all sorts. The purpose of using the broad array of pot is to tune the detectors.