The injection arm of an IT-O Interrogator droid
Injector arm or injection arm refers to a specialized attachment found on certain droid models, including medical droids and interrogation droids. This limb of a droid, equipped with a hypodermic injector, served the purpose of delivering different kinds of substances either to patients or to individuals being interrogated. For interrogation purposes, the arm required "priming" before use, and the target individual had to be kept stationary to ensure the arm could be used without difficulty.