GT-200

The GT200 is a controversial "remote substance detector" that was claimed by its manufacturer, UK-based Global Technical Ltd, to be able to detect from a distance various substances including explosives and drugs. The GT200 was sold to a number of countries for a cost of up to £22,000 per unit, but the device has been described as little more than "divining rods". The owner of Global Technical, Gary Bolton, was sentenced to seven years in prison.

https://en.wikipedia.org/wiki/GT200