Breaux and absinthe marketers may have the motive to say that vintage absinthes had low thujone content. That's a far cry from demonstrating that they're not correct.

Dr. Neils Arnold's number of 260 mg/l was an estimate he made in 1992 based on the amount of wormwood in pre-ban recipes.

Meanwhile, six independent studies that made actual measurements of thujone in vintage absinthes all showed concentrations of 9.4 mg/l or below.

The issue shouldn't be considered closed, but the theory of some grand conspiracy in which Breaux is pulling the wool over the eyes of the entire world is pretty weak.

See sources linked from this journal article: http://www.substanceabusepolicy.com/content/1/1/14