I don't know when this RIPA came into being but thankfully it wasn't there when I was a police officer. It is things like this which made me leave. Knocking on doors and asking questions was what good policing was all about. The British police took all the bad things from the USA. Pepper spray, tazers etc and just nose dived. I had a truncheon. I used it twice in 8 years to break windows to get people into their houses. No doubt there are rules against that now.