SP-4 & JN-66
"The analysis droids SP-4 and JN-66 assist Jedi Knight Obi-Wan Kenobi when he seeks their help in identifying a small toxic dart. The origin of the mysterious weapon may provide the only clue in discovering who is behind the assassination attempt on Senator Amidala. Deep within the great Jedi Temple, in an encased analysis room, the SP-4 droid examines the dart and searches for a possible link in its streaming bank of data. Typically reliable for such research, the analysis droid's assessment is less informative than the Jedi had hoped."