Antonio Caeiro
Thanks for the link. Antonio stabbed a man in self-defence and was arrested while the police made sure it was self-defence and not some other crime. He was then released without charge. Seems perfectly reasonable for police to investagte when someone is seriously wounded and ensure that it was self-defence. If the US police find a man standing over a body holding a knife dripping with blood and he tells them it was self-defence, they just take his word for it do they?
The police will investigate the case and can decide not to charge Mr Caeiro. Alternatively they can send a file of the evidence to the Crown Prosecution Service which will decide whether there is a case to answer and whether it would be in the public interest to prosecute.
Do you have an article where the investigation was concluded and he wasn't charged? I'd like to read it, just to have an ending to the story.