PostgreSQL 9.4.1 Documentation
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DROP EVENT TRIGGER

Name

DROP EVENT TRIGGER -- remove an event trigger

DROP EVENT TRIGGER [ IF EXISTS ] name [ CASCADE | RESTRICT ]

DROP EVENT TRIGGER removes an existing event trigger. To execute this command, the current user must be the owner of the event trigger.

IF EXISTS: Do not throw an error if the event trigger does not exist. A notice is issued in this case.
name: The name of the event trigger to remove.
CASCADE: Automatically drop objects that depend on the trigger.
RESTRICT: Refuse to drop the trigger if any objects depend on it. This is the default.

Destroy the trigger snitch:

DROP EVENT TRIGGER snitch;

There is no DROP EVENT TRIGGER statement in the SQL standard.