truck drivers in victoria are dealing drugs using codes over their radios .
it has been reported that 1 in 12 truck drivers are high when pulled over .
according to a former truckie , the trend is more common that you think .
a video has appeared online showing a man snorting ice behind the wheel .
he is driving a 40-tonne rig and says it is for his fatigue .
many are rorting the system so they can drive for 16 hours a day .