Bullet-probe

A Bullet-probe was a Cardassian surveillance device used in the 24th century. They featured a duranium sheathing and would activate and scan energy signatures as they detected them. Cardassians commonly used bullet-probes in the Bajoran system, when it was under their occupation, to try and detect Bajoran Resistance fighters. In 2370 at least one bullet-probe was used in the Davon system to guard the Cardassian mining moon Davonia. (DS9 novel: Devil in the Sky)