A Stimulant Injector system consists of an advanced life support system fitted within a Tau Battlesuit, and is able to flood the pilot's metabolic systems with life-sustaining combat stimulants and analgesic drugs should be become wounded so that he may continue to fight on at full effectiveness. A Stimulant Injector is a Tau Battlesuit Support System available to most forms of Tau Battlesuit. Whilst Stimulant Injector systems are now a commonly available Support System for use, when first introduced they were special-issue and entrusted only to Battlesuit pilots of the rank of Shas'vre or higher. The previous rarity of the system also meant that its distribution was limited to only one per Hunter Cadre, although this has since changed.