disconfirm
Demonstrate (something) to be untrue, especially if considered uncertain; falsify.
The Dude: "Why me, man?"
Brandt: "He believes the culprits might be the very people who, uh, soiled your rug, and you are in a unique position to confirm or disconfirm that suspicion."
Brandt: "He believes the culprits might be the very people who, uh, soiled your rug, and you are in a unique position to confirm or disconfirm that suspicion."