[_Algernon_]

It is extremely difficult to have a backdoor for encryption that only applies to some people, and no proposal for encryption backdoors AFAICT differentiate based on whether the subject has previously committed a crime. They are always blanket backdoors.

[ryao]

There is no difference between applying this to only criminals and applying it to everyone else. Vehicles are already being made with software speed limiters that users can control (e.g. Tesla vehicles). Once the state controls these, there is no technical barrier preventing it from only being applied to criminals.

The only real difference is that old vehicles need to be retrofitted, while the hardware and software needed to do this is largely already present in new vehicles (or soon will be in the remaining exceptions on the market).