The National Post reports in its Saturday, July 11, edition that Ottawa has approved a second device for police to test the saliva of drivers for recent weed use. The Post's Brian Platt writes that Justice Minister David Lametti signed an order on June 20 to okay the Abbott Sotoxa for use in Canada. Notice of the order was posted Friday in the Canada Gazette. It comes nearly a year after approval of the first device, the Drager Drugtest 5000. The saliva-testing devices do not claim to measure the impairment of a driver. Instead, they are roadside screening devices that indicate whether someone has recently used pot. If the test shows recent use, the driver can be taken in for further testing that would form the basis for criminal charges. "An oral fluid sample may provide grounds for the investigation to proceed further, either by making a demand for a drug recognition evaluation or for a blood sample," the government's notice says. Although the legislation allows for saliva-testing devices to also test for cocaine and methamphetamine, the Sotoxa is only approved for THC. Canadian courts have not yet issued rulings on the use of the devices. Lawyers warn they will challenge the reliability of the devices.