

There is no machine or drug or anything else that can “detect” a lie or signs of deception. Polygraph results are purely interpretive, and anything that’s given to interpretation is given to the bias of the interpreter. Polygraph results are also wildly inconsistent. That’s why they are generally not admissible in court.
Trump: “I challenge you to a fist fight!”
[gets punched]
Trump: “No fair! You cheated!”