Let's clarify who's fucking dumb and who's not:
Which drug tests do you want to discuss? The initial drug test when hired/given a job offer, which has nothing to do with turnover. Yet is the one you brought up and I disbuted your claim that it's given before a job offer. Which is the one you and I where discussing that had nothing to do with turnover? Or the drug tests that come after the initial drug test that continue during employment that do effect turnover that you didn't bring up? It sounds like you want to discuss the latter, now that you have clarified you are talking about the drug tests that effect turnover. Yet it's not the drug tests you brought into your argument.
I can understand where you made your mistake, because you seem to be under the impression that the initial drug test is what determines if an employer has found an employee who can pass a drug test or not. Which is really not the case for the most part. That is determined by the drug tests that come after the initial one, because the initial drug test is the easiest drug test for drug users to pass. It's really just a formality because of that fact. (Also, most drug tests now days also include alcohol). The drug tests that come after where they have no warning about (random or required) are the ones most employees fail. It doesn't matter if they fail it after a month of employment, or a year of employment, the employer failed to find someone who can pass drug tests. Which has a big effect on turnover, and the very drug tests the original poster you made you claim against was most likely referring to since he mentioned turnover, not the initial drug tests during hiring that you brought up which has zero to do with turnover.
There is a reason the majority of employers don't do drug testing. It's because a substantial of their employees would fail, and they would have a higher turnover rate. This is also why there are many employers who only do an initial drug test as a formality and don't care about having a drug free work place and they only do it for the incentives, which OSHA cut back in 2015, and/or image, and don't want it to increase their turnover rate.
Also for the record, Amazon does random drug testing.
So, Are we clear on who's fucking dumb, and who's not? Or shall we continue?