As we all know that, 

> 
> Any poison is nothing but a chemical compound.
> 
> 
> 

And as discussed in the question: [Chemicals-do-have-an-expiry-date](https://chemistry.stackexchange.com/questions/20039/do-chemicals-have-an-expiry-date)!

So, my question is: Is poison still poisonous after its 'expiration date'? and **Is every poison always as poisonous as just after it was synthesised ?**

please feel free to update with the suitable tag(s).