Letting people get away because of too much paperwork
Anthony - RIPA covers more than intercepts, it covers every type of survillance.
I'll give you an example a friend whos a copper told me that demonstrates the point.
A guy had his car stolen with the keys at 2:00 AM and reports it to police. Police find the car, parked and undamaged in another part of the city an couple of hours later by a passing patrol recognising the registration. There is no one nearby.
The obvious thing to do would be to watch the car, see who returns to it and arrest them?
That is directed, covert surveillance and a pre-planned operation requiring RIPA authorization. That authorization is a 12 page form that must be completed, submitted to an inspector and then to the duty officer - someone of superintendent rank who at 4:00 AM will be in bed (with an oncall phone of course).
The authorising officer has to be satisfied that on the basis of the information in the form, which has to include exactly what kind of surveillance is to be used, where, by whom, for how long and for what purpose, that the intended action is proportionate to the circumstances and the risks of collateral intrusion and interference to the right to privacy can be weighed against the anticipated benefits of potentially apprehending someone who may or may not be guilty of an offense.
IF approved only then can surveillance be carried out.
Anyone found returning to the car BEFORE that approval, if arrested, would argue that the arrest was unlawful as it was the result of unauthorized surveillance and so any evidence obtained while they were in custody could not be admitted. - Car thief gets away.
That is of course unless you regard that situation as arising from circumstances that mean it would be impractical to get authorization in which case you can act in the interests of apprehending offenders and get approval retrospectively.
The former is what I think is meant by over interpretation and is exactly what happens.
In fact its probably worse because knowing what would be needed and the likelihood that approval wouldn't even be given at the end of it means it is never sought. Result: Car thief gets away because police are tied up in their paperwork.
So its not just about terrorists - unless you think there are more terror plots than stolen cars. I doubt that myself.