This was taken from a DNP source a while back and no dont ask me for his info I will ignore your pm.
DNP was legal at one point in time and approved by the FDA for consumption. Of course you have the people who go overboard, there have only been 4 confirmed deaths from DNP through oral consumption for purposes of fat loss.
If you are knowledgable about it, and its use and potential effects, you run little to no risk of coming close to death.
As far as legality, 2,4-Dinitrophenol is a legal chemical compound to purchase. However, since 9/11 attacks it has been put on a watch list for purchases in large quantity, and you will typically need to be a chemical research company or R&D company to come close to buying it.
To summarize, it is legal, however, when capped for consumption it may run into the grey area as far as legality goes. Just play it safe as with anything else you may use.