The difference is that the h&s tuning was well known up to '14, however nothing after that. The point is also that we don't need to broadcast that there may be options. When/if it comes to be, work through pm's, phone, email, etc. to get information. The EPA is actively searching out those that are out there doing this type of work and will not be letting up.
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If you are in Canada, make sure that you are clearly stating that you are north of the boarder and are working with a company that knows such and/or is as well such that big brother doesn't get all hyped up. We're, unfortunately, heading towards an underground industry.
Chris