but i think laws should have some "binding" effect on how police acts on suspects of murder like separating the suspects from their comrades to disenabling them from making up cover stories until beeing presented to a court or such?
also disenabling them from:
walking free and killing a next victim (maybe accidental witnesses they want to get rid of for undenyable cover stories)
destroying evidences as they seem fit
vanishing forever as they like
creating false evidences
All this is not regulated to at least some degree in laws to be followed strictly by police officers?
i am not talking about laws preventing actions of one person or two, but laws binding police in general on how to handle these suspects depending on the crime suspected and that there seems to be no doubt who was on-scene when that happened.