The BL-39 interrogator droid was a torture droid manufactured by Aratech, that was mainly used by the Galactic Empire. It was a direct successor if the IT-O Interrogator, which schematics were bought by Aratech after the Galactic Civil War. It could easily be converted into a medical assistant droid by making use of the droid's existing medical knowledge. Moff Nyna Calixte made use of these droids in her role as the Director of Imperial Intelligence.