Then, abruptly, "Are you sure that was truth-serum in that hypodermic?"
So the doctors gave him truth-serum so he would not try to conceal anything from them.
What sort of talents and abilities did he possess, that he could react thus to a truth-serum?
truth serum n.
Any of various hypnotic or anesthetic drugs, such as scopolamine or thiopental sodium, used to induce a subject under questioning to talk without inhibition.