When Is Drug Testing not Nearly Enough?

When is Drug Testing Not Nearly Enough?
It seems that it is getting harder and harder to get a job. From going through many interviews, to having to take drug testing and psychological tests, companies are making it extremely difficult for the "wrong" kind of people to gain access to their work environment. But are all these pre-employment tests really necessary?
I found numerous articles, web-sites, etc. that went along with this topic. It seems that pre-employment tests are causing quite a lot of controversy in the work forces recently. …