The American companies here in SA subject us to it too.
At my previous job, I ALWAYS got selected during RANDOM testing time My hypomanias at work apparantly presented as a drug addiction!

On one occasion I was in not such a good mood and threw a *****fit when my name was called out for "random" testing yet again. I didn't go though, my supervisor knew my dx and he persuaded them to "randomly" select someone else.

I work for another American company now (ADT) and drug testing is also part of their SOP's...

Been here nearly a year, and haven't heard of anyone actually being tested yet though, I think it's merely a formality, should they suspect drug abuse.

I can't speak for Americans, but disputing the testing here would just decrease the already tiny job market here for the common folk, so we give them our urine on demand