Hound Labs says it has developed a new way to detect THC from just one or two breaths. There aren't many details about the science behind the device—the company's web site notes that the "science is proprietary, [so] we cannot go into too much detail about how it works," only claiming that the new method will be fast and accurate. And while there is another THC breathalyzer in development, this one could also read a driver's blood alcohol concentration, which is more cost-effective and useful for police than carrying two separate devices. It's a silver bullet against cross-faders.