I'd say that in this situation, either:

1) TSA did their job, by realizing that an amount of marajuana (no matter how big or small) can't bring down an aircraft, and therefore ignoring it

or

2) TSA missed the marajuana in the illegal dragnet search they conduct at some checkpoints, because they were too busy confiscating all that dangerous bottled water from passengers

Either way the TSA didn't violate the passenger's rights in this situation, and I'd say that's a good thing! ^

If this was a decision on the part of TSA to keep their noses out of places where they don't belong, I'd say it's a step in the right direction.