what happened to privacy?

OK, so I can understand an employer wanting to know if an employee is taking crack or meth or heroin- but surely that would be obvious?
I'm not condoning drug use for recreational reasons, but I'm just saying, surely what you do on the weekends is for you to decide, not your employer- I can understand that for some jobs- especially dangerous jobs where you need your wits about you or for positions of responsibility- employers expectation is that staff will come to work capable of doing their job and not off their tits/ endangering anyone else.
but this test works for prescription antidepressants, sleeping/anxiety medication and painkillers- that is certainly no busness of your employer. thats your GPs problem- and they have to uphold patent confidentiality so what gives companies the right be to be so intrusive?

I'm sorry, but this really touched a nerve!

this is a comercally available device advertised for use by employers and its so "easy to use" it doesn't even need lab confirmation (although it is advised).
pregnancy tests aren't 100% accurate and they work on the same principal.

sick.