Fruit Machine (Homosexuality Test)

The subjects were made to view pornography; the device then measured the diameter of the pupils of the eyes (pupillary response test), perspiration, and pulse for a supposed erotic response. Although funding for the “fruit machine” project was cut off in the late 1960s, the investigations continued, and the RCMP collected files on over 9,000 “suspected” gay people. It had previously been determined that the pupils would dilate in relation to the amount of interest in the picture per the technique termed ‘the pupillary response test’.

Source: en.wikipedia.org