Indiana would have to rewite it regulations because right now the affected cars are EXEMPT from testing.I live in IN where there is emissions testing.
I guess we can wait and see, but it's not that much data. Every VW dealership in the country can instantly access whether any VW anywhere has had a recall fix. Not hard at all. Up here, it's really easy to deny plates for a vehicle that has not passed a test, but this would not even require a test, just a note tagged to the VIN that it has not completed the recall.
Further, its really a non-issue since those diesel cars make up only a modest % of what VW sells and make up something less than 1% of the cars on the road. So I suspect that Indiana will not even look at this as a real issue.