A British company developing the world's first portable fingerprint-based drug screening device has secured a further £2.5m (US$3.5m) investment from private UK and US investors.Intelligent Fingerprinting has developed a device which works by analysing the sweat from a fingerprint sample, will enable non-invasive, cost-effective screening for multiple drug groups in less than 10 minutes.A version of the device will allow the capture of a detailed image of the test subject's fingerprint. This image may be used to confirm personal identity in relation to the test result, ruling out false positives due to sample mix ups.Dr Jerry Walker, Chief Executive Officer, Intelligent Fingerprinting said: “This timely new investment represents another step forward for our company. It allows us to finalise our revolutionary mobile drug screening technology for market and begin the manufacturing process to meet early demand for the first of our planned fingerprint-based products.”Intelligent Fingerprinting secured initial investment in 2009, followed by the first round of funding from the company's US investors in 2012. Prior to today's announcement, the company has raised £5.73m of private investment in the past four years, in addition to the original seed funding of £0.5m. It has also secured several government-funded grants, including a sizeable grant from the EUREKA Eurostars Programme (administered by Innovate UK) and funding for pilot studies within the UK's National Health Service and coroners' services.