Not hearing about a prosecution doesnt really mean anything. But sure, the govt is definitely not looking to round up all designer steroid users.
But it is also true that the huge majority of people dont get prosecuted for possessing any type of steroids, regardless of how long ago it was put on the schedule.
I only brought up the issue with legality because I know some people are not in a position to take any risk at all. Grey area designer steroid clones are certainly in a different category than other non-fda approved supplements, even if they dont carry the same potential penalties as pharmaceutical steroids.