One study found a field sobriety test to correctly classify impaired driving state due to THC 65-75% of the time [1]. The chance of a false positive seems too h

One study found a field sobriety test to correctly classify impaired driving state due to THC 65-75% of the time [1]. The chance of a false positive seems too high to me given the harsh penalty of a DUI. Field sobriety tests have been shown to be ~91-94% reliable for alcohol impairment [2]. 1 - http://www.sciencedirect.com/science/article/pii/S0379073804007674 http://www.sciencedirect.com/science/article/pii/S0379073804... 2 - http://hfs.sagepub.com/content/48/3/608.short http://hfs.sagepub.com/content/48/3/608.short