Family of recognition testing procedures, including known solution, searching (probing), and stimulation tests. A Known Solution POT (KSPOT) is used to determine whether the examinee is aware of details of a crime that have been kept from the general public and would presumably only be known to the perpetrator of the crime or those with incriminating knowledge. A Searching POT (SPOT) is used to determine details of a crime that are not known to officials, such as the location of an unrecovered body, but would be known to a participant in the crime. The evaluation criterion of Peak of Tension strip charts is simply identifying the point in the tracings where physiologic arousal has peaked, hence the name. The peak of Tension tests is not generally used to determine truth or deception, but rather to assist in the investigation or interrogation.