Voices in your head was insanity now it is science. How many time we hear a person does something that he says he heard someone talking to him. I remember a news reporter on TV yelling someone was hammering some where but no other could hear it. They try and bring out this as a good idea but it could be misused. MIT used a laser to transmit audio directly into a person's ear https://futurism.com/the-byte/laser-beam-speech-mit
Yes Don if you wanted to put someone in the nut house for Paranoid Schizophrenia than here is the way to do it. This technology is not new so I wonder if it might have been done.