Earlier quoted context omitted.
It's a technology. What you could do with it, and what you should do with it are completely different things. If you follow the links there is a lot of information about the trial, including a whole series of documents identifying the legal framework that authorises LFR, including rationale under GDPR, Data Protection etc. Of course, this technology could be used for bad purposes. But within a democracy, policing hap…
The UK stopped being a democracy a long time ago. In the UK if you keep your mouth shut during an investigation, it may harm your defense. There is zero right against self-incrimination. It is also the place where you can be jailed for not providing the PIN to your phone. I could go on.
The only realistic protection here is a “decoy” partition, a partition that provides access to a separate installation of the OS. That gives the device owner plausible deniability that their real system even exists.