They've taken his computer and mobile phone away. There'll be enough evidence on those apart from anything else. We didn't see him being arrested but presumably he has now. Not being in the police myself I wouldn't know, but I guess the idea of not liking a grass wouldn't extend to someone who blew the whistle on a rapist and someone who helped groom young girls. If it does, there's no hope for any of us when it comes to relying on the police.