Re. The Police and the Law.
I hd an interesting discussion with the plod the other day regarding some chemistry experiment or other, and they didn't know if it was restricted or not.
Interesting to note that as of 2 September 2014 in the EU you can't legally buy, possess or sell >9% H2O2, >30% nitromethane, >35% nitrate (ie KNO3, etc) or any concentration of nitric acid.
Which sucks for the R/C car folks and homebrew PCB etchers as H2O2/HCl is one of the better etchants and does not ruin PCBs nearly as quickly if you get the photoresist slightly wrong.
Nitric acid is also used for gold refining, in combination with hydrochloric and also for many other useful reactions such as making some polymers.