Chip costing ₹7 can sniff out cocaine within minutes

US-based researchers have developed a chemical sensing chip that was able to detect cocaine within minutes in lab experiments. "It can be produced using raw materials that cost around 10 cents (nearly ₹7), and the fabrication techniques are also low-cost," said researchers. The chip could be integrated into a handheld device for detecting drugs in blood, breath, urine or saliva.