The Klingon Mind-scanner, sometimes called Mind-sifter, sometimes called mind-ripper - is an interrogation tool. We see this used on Spock in the TOS Episode S1:E27 Errand of Mercy.
We know that the Star Trek Universe has technology called a Thought-maker from the TNG Episode S1:E9 The Battle.
We know a little of Klingon interrogation from Discovery S1:E4 The Butcher's Knife Cares Not for the Lamb's Cry.
My question is: Can the Klingon Mind-sifter be used to alter a person's memories?
Not canonically on screen, though not denied either, but in licensed fiction from as early as the story 'Mind-sifter' [in Star Trek: The New Voyages (1976) the first licensed short story collection] by Shirley S. Maiewski
I no longer own a copy, but from memory, Kirk's memories were muddled and dimmed (which is altered to a degree) but short of building false memories of any detail.
It was adapted for the fan Phase II project here, with the original author's agreement, and the full script is here: https://www.fanfiction.net/s/6155771/1/MindSifter. This confirms it could block memories, by inducing intolerable pain when the subject tries to access them, but it is not shown as being capable of creating new ones.
