as with most things it a burden of proof thing, procedure, etc, and if you think thats bad, try an arrest! lol it's not unknown for it to take up most of a shift, and quite rightly the prisoners care becomes your primary duty, however this can lead to losing at least one officer for up to 6 hours, and possibly more for the time to write up their account of the incident, i think the quickest i dealt with someone was drink drive, from stopping them, roadside breath test, arrest, transport to station, booking in, station breath test, charge release and court papers took 4 hours and a lot of that was down to him being quite co-operative
there are plans i beleive for the handheld type computers for the future, but again it's still the same thing where evidence in the form of the officers observations will be required,
society demands full police accountabilty, quite rightly too, to the extent that they will force more officers away from frontline work and to a desk to write up what they have had a chance to do, if thats the police force society wants, then they will get it,