alt Hacker NewsYes, they would have to prove that there was incriminating data on the phone. However, destroying potential evidence before there is suspicion of a crime is also a crime if done with intent to undermine a future investigation.
It's quite unadvisable to destroy data in front of any sort of law enforcement. Last ditch effort? Sure, you better your odds but it's not ideal. If you have evidence of a crime, you know, wipe it way before you need to hand things over for examination and be in the position of having to destroy data as they knock on your door.
You keep saying "potential evidence." What does that even mean? If I factory reset my phone right now, am I guilty of destroying "potential evidence?" Do you have "potential evidence" on any of your devices? Let's not make up phrases to help justify what they were doing. There was either an actual crime committed, and wiping the phone destroyed real evidence. Or there was not. You can't just consider all data everywhere to be "potential evidence" while you look around for some kind of crime that it's evidence of.
If it was evidence, what was the crime?