[Source] Control chips, also known as inhibitor chips, were a type of inorganic bio-chip capable of dictating or responding to the thoughts of its host. Kaminoan cloners implanted them within each clone trooper in the Grand Army of the Republic. It was installed into the brain of every trooper at the third stage of their embryonic development. The Galactic Empire later employed these devices to keep in line its enslaved Wookiee population on Kashyyyk.