How do I file a complaint against a Police officer?

If what you said is true then you can have the neighbour on breaking and entering charges as well as ault and battery. As for the police officer you could have him charged with negligence but it's awfully hard to win a case against a police officer, most judges will take their word over evidence that's right in front of them. But if you still have any marks on your arm take a picture of it yourself.