We've had discussions over DWI roadblocks before but what would you think about drug testing roadblocks? In Victoria, Australia police have been testing drivers for drugs and have found one in every 73 motorists is testing positive for cannabis or methamphetamines, which was three times higher than those breathtested for alcohol. Once a laboratory confirms the tests, the driver faces fines of $307 and three points on their license. The "drug bus" uses a saliva test to determine if the driver is under the influence of an illegal drug. Fire away.