WTF? Bullying _is_ against the law. You repeatedly intimidate and threaten me, causing me to fear for my safety? That's "assault". You trip me, making me drop my lunchbox? That's "battery". And so on. Just because you're a child and in a sane system you would be required to undergo counselling rather than also be facing fines/prison as adults might, or because in the farcical bizarro world of many schools that you get away with it, doesn't make what you're doing even remotely lawful.
That officer who, instead of conducting a proper investigation into a potential serial harassment/assault/battery case, told the victim to delete the recording or be charged with felony wiretapping? That officer should be hauled up to explain why he shouldn't be charged with "destruction of evidence and obstruction of justice under colour of authority", which are federal crimes. And if it was done under orders from above? Add "conspiracy under colour of authority".
But, of course, that's in a sane and rational justice system that actually contains justice, rather than the authoritarian sociopathic farce that is far too common.
(note: exact wording of charges may/will differ depending on your jurisdiction / country of residence)