The technology could also be used by oppressive governments to harass dissenters (and anyone else they might target). Essentially modern, high-tech COINTELPRO.
The Australian Human Rights Commission discussed many of these
issues in its March report,
"Protecting Cognition: Background Paper on Neurotechnology":
It came to light because some financial records were sent to the CIA's Retired Records Center for some reason and escaped destruction. See page 5 of [1].