If the law tells you "if you delete any of your text communications relative to this case I will slap you" and you either:

* Make text communications and manually delete them after

* Make text communications through a channel that you yourself set to delete after

* Try to take the piss out of the law and say on your text communication "let's talk about this subject that I definitely have to record all my texts for in person so I don't have to send texts"

should you really be surprised when the law slaps the shit out of you ? If there's one thing it hates, it's being taken for a fool.