EPA and CARB have been prosecuting/fining diesel tuners recently. So much so that all of the US diesel tuners have stopped offering delete tunes and parts for the deletes, it has been an interesting topic to follow on the diesel forums. Some of the US diesel tuners have started making emissions compliant tunes and actually testing them for emissions levels, even putting in labs (smoke meters, horiba, etc).
Diesels are probably the most visible due to kids rolling coal for years. I would imagine that other aftermarket companies are headed down the same path, thoughts?