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First use will be for criminal suspects, to "save lives". Then its use slowly expands from there.

"For the children" is the first excuse usually.

Exactly! Strap it on anyone who has to work with children to see if they ever have any untoward thoughts.... Then move on to everyone else.

"To fight terrorism" usually is the second.

I'm sure among the first applications of this technology will be to scan user thoughts for evidence of CSAM.