British fraudsters Gary Bolton and James McCormick were jailed in 2013 for making millions selling the GT200 and similar devices billed as "magic wands" able to detect tiny particles of explosives or drugs from hundreds of metres away.
The GT200 was in fact a useless home-made plastic box with a radio antenna - made for a few dollars but sold for between USD 3,300-USD 13,000 per unit to governments including Thailand, Mexico and Iraq.
British authorities should reveal "particularly the contracts of broker companies which sold them (GT200) to the Thai government and how much they cost", he said in a YouTube post.
A corruption probe into why the Thai military and several other departments ordered hundreds of the devices has ground to a halt.
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Opponents of the junta say investigations into allegations of army graft routinely go nowhere, with courts unwilling to tarnish the image of the powerful military.
He repeatedly defended the use of the fake detectors even as tests cast serious doubt over its efficacy.
By 2010 the detection powers of the GT200 had been debunked.
That year Anupong told reporters that "we don't have a replacement yet so we continue to use it".
Last week Prime Minister Prayut Chan-O-Cha, a senior general during Anupong's tenure as army chief, said the device was "useful once... But when they were proven to be useless they were not used anymore".
"Regardless of court rulings in the UK and overwhelming scientific evidence, Thai military leadership still defend the use of GT200," said Sunai Phasuk of Human Rights Watch Asia.
He said the first sales took place in 2005, ultimately amounting to orders of nearly 1,400 GT200s worth $32 million across 15 separate Thai agencies.
Sunai called for a probe into possible loss of life and the "large numbers of wrongful arrests" in Thailand's conflict-racked south due to the use of the bogus equipment.