Cart before horse?

Why, my paper asks, was Damien Green MP arrested rather than just questioned by the police? How naïve! The answer is of course that by arresting a person the police thereby get the authority to search their house and other premises - hoping of course that by so doing they will uncover evidence to justify the arrest. Shamelessly cynical, but that's the way the police work these days, and until someone is brave enough - and rich enough - to take them to court and challenge the basis of the "reasonable belief" on which they founded their decision to arrest, they will continue to do so.