Fair enough. Now how do they plan on enforcing these rules?
The technical approach to this would be to clone some existing version control system and have a country's court system run its own equivalent of GitHub, so that police could submit crimes and evidence as they are investigated/discovered but not monkey about with their own records. Of course such a system would not be cost-free, and it would still be open to abuses from both sides.
Of course, parallel construction renders this traditional protection utterly meaningless.
The way they always have, in court. If the prosecutor submits evidence taken from a phone, but doesn't show the gathering of that evidence falls under the rules, the evidence gets thrown out.