Since you seem to know about this, what are the actual rules about "destruction of evidence" in your jurisdiction? What does the accused need to have known for a crime to have been committed?

(Common sense tells me that the accusation might make sense both in cases in which the accused knows about a crime and in cases in which the accused knows about a police investigation, even in the absence of a crime, but deleting nude photographs to stop a customs officer from seeing them, for a random example, would that be a crime?)