They did do trials - pre-arranged trials. A credulous audience and bribed officials and senior military figures.
Totally agree that he is a vile and unscrupulous individual - still defending their efficacy in a TV interview outside of court!
There is a german company been selling similar stuff all around the globe too - I was surprised at how many countries they were being sold into.
It is also a bit disappointing to see that the UK govt, despite being warned that these things were fake, did nothing much to stop the export. Guardian link below, containing a further link to the redacted emails that went between departments...
http://www.guardian.co.uk/uk/2013/apr/23/uk-government-helped-fake-bomb-detector-fraudster