"It takes more than one shot for it to work, since the effect is weak."
An. Dart S is an item that can be found in Dino Crisis.
This dart can be combined with the Franchi PA3 or Franchi S.P.A.S. 12 to create ammunition. If two darts are shot it causes the enemy to temporarily fall asleep, otherwise nothing happens.
This item may be only available after starting a game, except with no clear counts, and near the locked door leading to Parts Storage, at the Experiment Room Hall.