It's a basic principle of law that both sides kick off equal and do their best. It might seem nice to say - Well, he's a swine, must be guilty, but when you make an exception from the law once, you damage the whole system....soon you come to - Oh well, he's black, looked at me funny - guilty! and Oh, he's rich, must be OK-. Therefore, any breach of the law by the police or the prosecution has to be treated strictly, as they have the power to tits around with the evidence, batter the suspect etc. if they are not held to it. Democracy and the Rule of Law go together - unfortunately that means that sometimes, we have to put up with a verdict we don't like.