Poison snooper

Poison snoopers were devices designed to detect poison in food, known as chaumas, or in drink, known as chaumurky. The glossary of Dune describes the snooper as a radiation analyser within the olfactory spectrum, keyed to detect poisonous substances, and it was an essential precaution in a society where assassination by poison was a constant danger of high politics. (Dune)

Types and limits#

Snoopers came in fixed and portable forms. On Arrakis, Hawat had a snooper installed over the Duke's dining table, and at the formal banquet in Arrakeen the mechanism was hidden up in the shadows where the chandelier's chain disappeared. Portable snoopers could be brought in wherever a meal was served: the one in the conference room at breakfast had sensor arms that hung limply over the table, which put Paul in mind of a dead insect. (Dune)

Snoopers were not infallible, and some poisons got past them. They belonged to the noble Houses, the class most often in need of them. Brian Herbert and Kevin J. Anderson's The Winds of Dune puts it plainly: snoopers, personal shields and guards were a way of life for noble families in the Landsraad. (Dune; The Winds of Dune)

Use by House Atreides#

When House Atreides moved from Caladan to Arrakis, Duke Leto Atreides I told Lady Jessica that his Mentat and master of assassins, Thufir Hawat, had already put their own poison snooper over the dining table, and that there was a portable one in her room. At the banquet, guests made their own discreet checks with tiny remote snoopers. The limits of the technology proved decisive in the fall of the House. The poison gas in the false tooth fitted to Duke Leto gave no warning to Baron Vladimir Harkonnen's snooper until it was too late, and the soporific on the blade that Feyd-Rautha later wielded against Paul was chosen because it would not alert a snooper. (Dune)

The Fremen lived by other defences. Entering the sietch, Paul saw no snoopers anywhere in the cave warren, though he could smell poisons in the air. Dune Messiah shows how far that had changed: a snooper now waves its insect arms over the food in the Emperor's household, angering a man who remembers that they never needed snoopers in the desert days. (Dune; Dune Messiah)