For example, if they disobey these codes, evidence could be invalid in court, which might lead to the criminal getting off.
The main point of the ethical considerations is to avoid placing too much responsibly/ power/ temptation to an individual or organization.
The police can arrest anyone within reason. Maybe as a suspect of a previous crime or about to commit an offense. Aka the SOCP, which stands for serious organized crime and police act 2005.
An accused is presumed innocent until proven guilty and the burden of proof thus falls on the prosecution.
EU data retention directive, all transmitted information through electronically