The aim is to prevent the growing problem of clubbers having class A drugs such as rohypnol or GHB placed into their drinks, which cause sedation, amnesia, and muscle relaxation within 20 minutes and can cause blackouts that last between eight and 24 hours. Victims lose their inhibitions, become compliant, often feel affectionate and want to socialise. A large dose can leave them conscious but unable to move their body. Tests last year revealed one in 25 drinks analysed in an Essex nightclub were found to contain one of the two drugs. Mr Burnell, a web marketer, said: "At the moment there's the potential of having your drink spiked with drugs, or stronger alcohol as it was in my time. "If somebody tries to tamper with it, the sensor notices and the light comes on." The patent for the product was filed with the Patent Office last month and Mr Burnell is now seeking an investor to take the product on to the manufacturing process. He said he did not think it was too complex and was confident it would prove a success. A spokeswoman for North Wales Police said the force was aware of a number of devices being developed but did not endorse products. | 
