onedotright- your posts are intentional mischievous, and I'll add, utter nonsense. It would be helpful if your profile would at least indicate the basis of your interest and where you speak from, but up to now you are spouting garbage.
I have not seen any evidence of drug taking by pilots in my 34 years in professional aviation. The measures being adopted by BA are not 'shotgun' approaches to drug detection, but very tightly regulated and largely directed towards the humanitarian approach to addiction, should it be located. I believe it is the act of a responsible employer. The responsibility of the employee is not to try drugs and assist others to drop them if discovered, through the employer.
I think you will find that pilots, controllers and engineers are all very aware of their responsibilities, and obey them. This legislation is to alow new employees to be checked, and those who have experienced an addiction to be monitored. It seems very fair to me.