X-13 is a short-term memory erasing drug. It causes limited amnesia, typically for a period of about 24 hours. The amnesia it induces can be defeated by hypnotic recall sessions, and it is known to be diminished in effectiveness if the subject’s bloodstream has a high alcohol level.
It is applied as an aerosol spray, and tends to knock out the subject upon application, generally for a period of several hours. X-13‘s very existence is a classified secret, and it is available only to agents of the NSA and CIA, although stocks do occasionally turn up on the black market.