In terms of the current canon, psychometry first showed up in the “Star Wars: The Clone Wars” season 3 episode “Hunt for Ziro,” in which the Jedi Master Quinlan Vos tracked Jabba the Hutt’s uncle Ziro by using items like a cup he had drunken from or the ground he had recently touched. As you might imagine, his mastery in this area also made Vos a figure of controversy. The Jedi Council, in particular, was quite wary of this power, realizing it could potentially expose a Jedi to the dark side if used on an object with a history of terrible violence or some other ties to violent emotions. Turns out, they were right to be concerned.
During the video game “Star Wars Jedi: Fallen Order,” the Jedi Cal Kestis gets his mitts on the lightsaber of the Jedi-hunting Inquisitor known as the Second Sister, only to find himself briefly paralyzed when he catches a glimpse at her disturbing past (back when she was a young Jedi who was captured and tortured into serving the Empire). Luckily, rather than attacking him while his guard is down, the Second Sister merely elects to flee.
Everyone’s favorite Jakku scavenger turned Jedi Rey similarly had an unexpected vision of the dark history of Luke Skywalker’s lightsaber upon grasping it in “Star Wars: Episode VII — The Force Awakens,” much like she did while holding the Blade of Ochi (more commonly referred to as the Sith Dagger) during “Episode IX — The Rise of Skywalker.” In both cases, the characters’ unintentional use of psychometry could have gone very badly very quickly, had they been less fortunate.