Jerec forcibly extracts details about the Valley of the Jedi from the consciousness of Qu Rahn.
Drain Knowledge, which is also referred to as a Mind probe, represented a dark side telepathic power; it was used to forcefully obtain information from a thinking being without their agreement.
Going further than simply perceiving thoughts, the Drain Knowledge power manipulated the Force to seize profound recollections and data with intense force and cruelty. The subject's mental state could be negatively impacted by such an action.
Revan employed this ability on The One during his initial quest for the Star Forge, with the purpose of learning Rakatan. He also forced Basic into his mind, thus allowing the Rakatan to communicate with him using Basic. In order to blackmail Atton Rand, Kreia utilized this power to uncover his mysterious history. It's possible that Jedi Master Atris threatened Meetra Surik with this ability to compel her to reveal the reason for the destruction of the Peragus Mining Facility while questioning her.
After trapping Revan in stasis, the Sith Emperor made use of this ability against him for a period of 300 years. This was done to acquire knowledge of the Republic's strengths and weaknesses, which would aid in planning a more successful war. Darth Silthar applied this technique on Tusken Raiders with the goal of discovering the location of a spiritual map.
While using invisibility, Darth Maul employed this technique on a pair of Coruscant Security Force investigators to ascertain whether they had located a holocron crystal that had belonged to the deceased Hath Monchar. While holding Obi-Wan Kenobi as a captive on Geonosis, Darth Tyranus utilized this power to identify any vulnerabilities in the defenses of the Jedi Master. In their second encounter, Darth Vader employed this ability against Luke Skywalker to find out that he had a twin sister. However, when he used it on Leia years prior, he did not discover her Force sensitivity. Jerec employed it against Qu Rahn, thereby discovering that the location of the Valley of the Jedi was known by the late Morgan Katarn.
It is possible that Kyp Durron (while under the control of Exar Kun) employed this ability to forcibly extract or eliminate scientific knowledge (related to the Sun Crusher) from the mind of Qwi Xux. Jacen Solo employed it on the former Queen Mother Ta'a Chume to determine if she had any connections with the Dark Nest in an attempt to kill his child, Allana. His actions resulted in lasting brain damage, leaving Ta'a Chume in a comatose state. Darth Talon employed it on the defeated Imperial Knight Elke Vetter to obtain details about the escaping Princess Marasiah Fel.