Let me tell you a story. Maybe it will pass on some ideas. 
Something I learnt (to my surprise) when I moved down here back in the 1700’s was the impact of Weed related substances. (It is of course illegal to Smoke any derivatives down here)
Back then there was a case of two Air Hostesses who had been passengers in a car that had an accident that resulted in some minor injuries. The driver was tested and found to have consumed a SMALL amount of alcohol - well under the UK limit - (BUT also illegal unless you have a permit - a tale for later in the thread btw) so all the occupants of the car were tested.
The two Hosties were arrested as they failed a Drugs test. Some 3 weeks early they had been on Vacation in Thailand and had consumed some Weed while up and around Chang Mai. Obviously they were not “under the influence” yet the tests showed minimal remnants of Weed in their bloodstream. (Now that was a surprise, none of us knew that “Weed” stays in your system for up to 4 weeks - which made us realise why most Footballers consume Coke)
The SURPRISE for everyone here was that they were found guilty of POSSESSION and received FOUR YEAR sentences. NONE of that is a criticism of the rules here, it was a lesson to EVERYONE on how the law was actually interpreted.
So this meant that anyone who for example had a stop over in Amsterdam and stood next to a “Smoker” etc was then breaking the law when they came “home”
Fast forward and I had a situation where our Employer wanted to implement the standard Random Drugs and Alcohol Tests at work - I won the battle and they were removed from everyone’s Contracts in a hurry.
I caught them using FEAR and “The threat of” the much maligned European Court of Human RIghts no less- NOT because “we all wanted to consume illegal Drugs” but because of the Alcohol & Drug issue in THIS Country
Alcohol is available to purchase at Duty Free on Arrival, and in Licenced Bars in Hotels & Sports Clubs. You just buy it. It is also available from “shops” in other Emirates (read that as Counties) some 45 minutes from Dubai, OR it is available from a “Booze Shop” for which you need a Liquor Permit.
Nobody asks for a permit EXCEPT these shops. BUT should you get caught doing something wrong by the Police and NOT have a permit then you have committed a criminal offence with a 3 month Jail Sentence. (This is something that Tourists get very wrong when they give it large after a few bevvies) But the basic rule is behave and you don’t notice. The Licence costs 30 quid a year but you get vouchers worth 100 quid.
So, back to the Employer. First of all the Employment Contracts were standard and global so the first point of Law that they had missed out was:
"What is the ACTUAL limit?. In the UK this is important as you can be legal to drive but could lose your job? That actually for an Office Bound Emplyee COULD be a cause for legal action. The Company would have to PROVE that 0.00001% of Alcohol in your system - for eg caused by having a Steak in Red Wine Sauce for Lunch caused you to lose your job? BIG PR Risk for the employer that!
Down here there were two issues
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The legal Alcohol llimit is ZERO.
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Any failed Drug or Acohol Test performed by any Approved Medical Centre MUST be reported to the Authorities. Under UAE Law you fail a test you get arrested and only when you appear in Court can you give your Alcohol Permit as Evidence of Innonence. (Pedantic but logical as in 99% of cases you would have only been there IF you had committed another crime)
So any employee having 0.00001% of Alcohol in their system would be arrested, held in Jail on Remand for up to a week and would have to appear in Court about a year later having had to surrender their passport!
Only then would they HAVE to hold a Liqour Licence OR the Company Test would mean a Jail Sentence. So straight away
“You have to pay for Alcohol Permits for all staff members” would be the obvious call - HR has no budget is the answer. You have to pay Salary while they are in Jail for no reason, oh and THEN you have to pay them Damages for impacting their ability to travel.
THEN the issue came up of “lapsed Muslims” who CANNOT get a licence and suddenly an action by HR could destroy more than a persons employment.
So quick call to a good lawyer (my Daughter) quick check of the much maligned European Court of Human Rights and we found enough vague waffle to scare the BeeJesus out of the HR Department by showing that anyone getting caught in this mess could sue them for damages in the millions of Euros. (YAY! Pension Plan we all cried!
)
Then, we added in the Glastonbury Factor. Namely that anyone who attends something like Glasto will be in the presence of a large number of people who are “consuming Drugs” and that it would not be logical nor feasible for anyone to avoid “Passive Smoking” (God Bless all that UK Research that led to the Ban on Smoking in Pubs!) - so again, the HR rules could jeopardise more than the Employment prospects of an Employee who would have witnesses who could testify that no “Drugs” had been consumer. (UAE Law does not allow that as a Defence btw) yet an Employee could be Jailed for 4 years.
So the short of it is - if it is a new policy a good lawyer can rip it to shreds in a few seconds. For us it took 8 weeks to rip it to shreds and about 1000 pounds of legal fees. They then had to drop the policy world-wide when they reallised that they had too many variables that they had missed in the lazy assed introduction.
In other words - this is a great way to Fvck Globalisation.
(The Author of this book fully understands that Certain Job Functions must have Zero Tolerance - I don’t want my Airplane Pilot under the influence when I fly home!
Yet HR are SOB’s and lazy when it comes to policy and rely on fear and intimidation to get away with murder - source my mate who’s a Glbal VP of HR)