From my understanding, going after the small fish is not going to happen. The laws stipulate it is not against the law to have the stuff and use it. Therefor prior transactions are not an issue if its already in your house unless of course you have a stock pile then it would not be personal use. They can prove you bought it but can only charge you if caught buying it, if ya get what I'm saying.. When a lab goes down and they really want to catch the big buyers they will keep shop open in an effort to catch the bigger fish.
This where loyalty to a lab comes into play, stay with the same lab for a while build a rapport with the rep and if something is up then your gonna know just by mannerisms of emails and such that something is wrong. I strongly believe this and laugh when I see people trying to save 5$ on a bottle when what they have works .. I know in Canada there is a new lab that pops up daily and sometimes prices are rock bottom but I never forget that.... the best might not always be the cheapest, but it will always be the best....