[xaduha]

You don't need to trust PINs, they aren't passwords in technical sense. And you don't need to enter wrong PINs either, if someone else tries they would reach a limit very soon.

It's all seems pretty arbitrary to me as to whether something is considered destruction of evidence and it's very US-centric anyway. So I'd say yes, deniable encryption is needed. If they decide you're not playing ball, then you'll be punished. The difference is whether they will use a legal system for that in a First World country or something else if you're not so lucky.