That does not mean there are less drugs being imported, just that less are being seized. I worked with the Border Patrol years ago and it was astounding how they tracked success:
- When arrests increased, they celebrated that enforcement was working.
- When arrests decreased, they celebrated that deterrence was working.
Heads I win, tails you lose.
While I'm in favor of legalization, you should take these numbers and the process that created them with a grain of salt..