That's a great point. The whole tone is "we know he is guilty but traditional policing methods have been unable to prove that, therefore we must have these additional powers to prove what we already know".

Also...

> Enquiries showed that he was contacting these females

What are these mysterious enquiries? Why not follow up on those? If one or more of those victims was willing to give access to their devices/accounts they'd get the evidence they needed anyway.