So it turns out that some folks on the left want to use the Braun verdict as some kind of validation of the supposedly unique benefits offered by collective bargaining. Apparently non-unionized employers who do drug testing don't care about chain of custody or whether their testing results are accurate. They just want to jettison employees without regard to whether or not they have used drugs.
I have advised on such a program (although I am not a fan of drug testing in non-hazardous or athletic workplaces) and I must have been hallucinating about the care and fairness that non-unionized employer insisted upon. Yes, they were wonderful people but they were also acting in their self interest. Why would you want a program that wasn't as accurate?
There are arguments that can be made for unionization. But treating employees more "fairly" is generally not one of them. Under certain circumstances - mostly in private companies facing few competitive pressures, unions can increase wages. The implementation of work rules and process beyond those that an employer would rationally choose are far more likely to protect poor performers than the unjustly treated.