You're perfectly safe Khandro. Peter Pedant has outlined typical methods of neutralising certain toxic compounds and nowadays the methods are fundamentally the same with some variation due to improved technologies. Nevertheless, other methods are available.The instrumentation cited in Pongoparrot's post has been improved upon considerably which allows scientists, engineers and weapon experts to decide on the best method of destruction.
None of these compounds are particularly difficult to neutralise in practice. They are certainly not stored anywhere in Europe as the legislation on the matter throughout the EU is very specific on the issue. The legislation concerned is solid and the EU has been very good at ensuring compliance in all affected countries.
I've been known to spend a good few hours every month mooching around within Porton Down so I've some contemporary experience on this matter.