Probably is- but if the RFID tag says a box weighs 50 pounds, and it comes in weighing 45 pounds, then you can throw up flags. Of course, there's always going to be ways around this sort of stuff, but you just have to raise the cost of getting around them just enough for it to be unprofitable.

Also, I've heard that cartel-grade MJ is terrible quality- local cultivation is probably pretty different then whatever shit they can grow.