First, that is not an actual statute and second exactly what "evidence" is my phone, evidence of what exactly?

Evidence of anything. You're tampering with evidence if you act to prevent them from seeing something, even if they had no reason for suspicion. Like how you get arrested for fleeing even if you didn't do anything wrong.

> even if they had no reason for suspicion

Are you sure about that?

Sure - if we were banana republic (which we may be or becoming...)