You are an idiot, the justification is the business owner wants to and can do it, you don't like it, tough shit. You have no reason or justification not to.
"Wants to" is not a basis.
Still nothing.
Good, but it is legal, it is being done, whether you think it is right or wrong is irrelevant.
Here links and the cost of drug abuse.
How Illicit Drug Use Affects Business and the Economy The White House The Real Cost and Effects of Substance and Prescription Drug Abuse For Professionals and Employers Addiction Hope
Now these are potential losses however a business does not need or want an added expense, potential losses can add up.
I don't care whether you agree with me or not but I deal with people and drug abuse in the work place and I can tell you it cost a lot of money. We had a guy who had an accident in a piece of equipment, it cost us $7,000, then we he tested positive for marijuana, he admitted to smoking just before work, we are required to send him to rehab and foot the bill.
You can bullshit all you want but it costs, why should a business put themselves at risk? Please explain why they need to take a chance, when they can get a person that doesn't have the drug problems?
The point is not, and never was, whether it's "legal" or being done. We all know it is. The question is, is there a justification for it? This is the one you haven't come up with an answer for. Addressing that question separates those of us who just roll over when Authority barks, and those of us who stand up and say, "hold up, this is wrong".
(Edit: see distinction between "drugs" and cannabis, next post. Nothing here has been about actual drugs, addictions or "problems")
Interestingly, it's the same question that can't be addressed about the illegalization of weed in the first place. We languish under a law based on complete bullshit, by now we all know it's bullshit, and yet some o' y'all continue bleating "yes master, may I have another". I find such obsequiousness disgusting.
Legalize pot, I don't care. I have long been on record of legalizing it, in fact I'm for legalizing lots of drugs and tax the hell out of it. They can help fund the rehab facilities.
You want to smoke, shoot up, snort, go right ahead.
I am for, an employer not hiring you because you can't pass a skills test, can't lift one pound, you make stupid posts, whatever the hell his reason is. If a business wants to drug test you, fine by me, and if I don't want to work for an ass that drug tests others fine.
I'm not justifying it, it is an employers right. I don't care if it is justified or not. A business has a right to protect itself from liability and unnecessary risks. The potential of loss is there, the links prove drug abuse causes loss of money. That is justification enough.
Now if a business doesn't want to drug test, more power to them. I don't care.
So, I won't justify it because that is blatantly stupid.
Work for whoever you want, hire who you want.