Interra Shot is a drug that is used to open the subconscious to direct interrogation, forcing the subject to answers questions truthfully.
First edition GW: This “truth serum” opens the recipient’s subconscious to direct interrogation. When the drug wears off (in ten minutes) the recipient will not remember having been questioned.
Second edition GW: A 10 centimeter long disposable jet-spray tube containing a sort of "truth serum" that opens the subconscious to direct interrogation. There is only a 5% chance that either Humanoids or Mutated Animals will be affected by it. If affected, the character answers all questions truthfully for 10 minutes and then forgets the interrogation.