FFF- you make some pretty serious, unsubstantiated accusations against British crews there. Under the new Calvinism about- I would say it never happens now if it ever did to the extent you imply.
Lets get this straight- random tests are not allowed. Positive accusation is required for a crew to have to undergo testing. The new legislation applies to new entrants and those with a historic drug taking history only. I think out of fairness to staff, you should refrain from making such vague and serious accusations.