"Conventional drug detection generally use techniques that require long operation time, sophisticated experimental procedures, and expensive equipment with well-trained professional operators; moreover, they are not usually portable," says Joon Hak Oh, head of The Oh lab for organic electronics laboratory at Pohang University of Science and Technology.

Joon Hak Oh's research team has solved all of these problems, apparently. And the result is portable test - and an app - that together can detect amphetamines in urine within seconds, whilst only costing $50 to make.