Please stop disseminating such misinformation.
DMSO is not illegal for use or for sale. It is included in many products in Europe (and elsewhere) for human consumption. Pretty much only in the US is it not allowed to be sold with specific targeting towards human use, though you can still find it pretty easily at a lot of health food stores and online. Regarding its use as a transdermal, sure many use it for illicit or controlled drug use, but it is also combined in products to deliver Traumeel (and Arnica) and many other legal substances. It is a great substance for the value.