Evidence of what?
What crime did this person commit that you needed the "evidence" on his phone?
This is as bullshit as seeing "resisting arrest" being the only conviction. You didn't have a legitimate reason to arrest, or you wouldn't have gone with "resisting", you would have convicted for that reason. If they were probably doing something illegal, then the conviction should be simple and easy, not "well we couldn't get the primary charges to stick, but when we broke his hand he fell, so he clearly resisted arrest and that's why he's in jail"