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If this is actually true, the collector is breaking the law. Clinic personnel are not authorized to frisk or touch you in any matter! Thats the job of persons connected with law enforcement and the legal system. Since you were taking a drug test for a job, and not a criminal being placed under arrest, unauthorized frisking constitutes groping by law. You should have contacted your States Attorneys Office regarding that incident.
Know your rights and dont be afraid to assert them!
Well, yes and no. If you go to a concert or board a plane, you can expect to be patted down at the entrance to some extent. They're obviously not going to go after your junk, but they will feel your pockets, around your waistband, and anywhere non-personal that you might be able to stash something. They can also ask you to take off your shoes. Law enforcement are the only folks who can forcibly frisk you, but everything else is voluntary. You "volunteer" to be frisked coming into a concert by trying to get in. You can opt out of your frisk by skipping the concert. The same works with drug testing clinics, in that, if you don't want to be frisked, you have the "option" of not taking the drug test, and therefore, not getting the job. Unfortunately, it's all semantics.