That's a very recent change put into effect from one seller (at least) due to all of the pressure being put on them by pro-lifers and politicians in the wake of all the recent suicides, especially amongst young people, due to SN ingestion. They're just trying to protect themselves from lawsuits, even though SN is perfectly legal, at least in the US. They aren't scams, at least the ones talked about regularly here on SaSu.