Earlier quoted context omitted.
Let me ask you this hypothetical question instead: What if we have a "brain encryption" technology that allows encrypting your brain so that brain scanners, thought detecting methods or emotion detectors cannot see through it? Would customs be allowed to ask for the decryption key? Or should the customs just ignore whatever is encrypted inside?
Of course they should be allowed to do so. That would eradicate drug trafficking and cross-border terrorism. I would say the benefit is too good, weighing against privacy.
No, it wouldn't. One key weakness of totalitarian systems (and that is what you are advocating for) is always that the massive power of the system attracts criminals and corruption into the system and has a major risk of the criminals ending up using the totalitarian power for themselves. If you think there is some sort of absolute solution to a social problem, you are ignoring that implementing the solution does itself build on society. If society isn't free of crime, your solution won't be free of crime either, and if society if free of crime, you don't need the solution. And if your solution isn't free of crime (so, you have corrupt police officers or judges or whatever), then you have thus given criminals the option to use a massively powerful weapon for themselves in some ways.