From the website of, Gullible Turnips regarding their GT200 comes the following............
'Due to the nature of the technology upon which GT200 is built, it would be impossible for it to detect a substance that it is not programmed to detect. In other words, if the GT200 obtain a lock on an area for substance that the GT200 is searching for, and a "close-in" search using Canines or IMS portable equipment turns up nothing, it does not mean that the GT200 produced a false positive'.
We know this device is crap and has no better chance than using a coathanger for the detection of drugs and explosives.
However, if you cannot find anything after obtaining, 'the lock', it is not the fault of the GT200. If you or your comrades should get blown to hell using this equipment, that is not our fault either, we call that, 'human error'.