Clearly the vast majority of people in aviation understand their responsibility to be alcohol and drug free while at work, flying, on an aerodrome or in the workshop
Well why persist in the stupid expensive dimwit inspired programme?
0.02 is barely a thereputic limit and only designed to take up the slack of inaccuracy's in equipment. Remember this whole thing came about by an over reaction to a less than thereaputic dose of weed at Hammo. (had a cone 3 months previous or something so stupid).
If they were serious there would be a zero limit and any positives confirmed by blood analysis.
We live in a "nanny state" governed by "nanny goats".