OK I concede, lets say 3 to 5 micrograms then that is near to zero, people are horrified when a drink driver kills someone, but say no to lowering the micrograms as in this thread.
As quoted here
I think the zero reading is being stated as whatever the standard measuring appliance shows as zero, at least it does in my estimation. Like the lee way on speeding there could be a minimal tolerance which would not entail prosecution.
I have no idea on how many hours until your sober, or there is zero alcohol in your system, I'm sure there are people very well paid who could work out times amounts etc for all of us to know where we stand. They should also be 100% correct working breath test that a person could do to know...