Line Of Duty is absolutely excellent and a cut above regular police procedura, but it bends the rules slightly: there are times when the first the audience is made aware of a piece of evidence is when it appears in the interview scenes. Magnifies the impact of the drama but at the expense of it not being even theoretically possible for the viewer to be ahead of the detectives.
One thing I find refreshing of British cop shows is how things that are trivial in US shows just aren't possible.
Neither cops nor criminals go guns blazing everywhere, simply because having access to a gun is a big deal. An entire season of Line of Duty is about this.
Cops in threatening situations cannot simply pull a gun out of the blue. This forces scriptwriters to become a bit more creative about problem resolution.
Whenever you're tired of US cop shows, try a British show!
