There is no more right to privacy in this country. We have allowed this to happen by not resisting these outrageous requests. If, as ghb69 suggests, it is part a screening exam for health benefits, that would normally be done after being hired, not as part of a pre-employment screening process. Drug screening used to be reserved for jobs requiring high security clearances, the military and such, which makes sense. Now it's routine for low paying, low skill, entry level jobs. It's just a method by which employers can minimize potential fiancial risk with a new hire, rather than waiting to observe their job performance. Now I suppose workers will be screened for potential risk due to chronic illness, or even for genetic markers that suggest a higher possibility for chronic illness.
We have slid way down a slippery slope, my friends. People who think that's not a problem and resistance is futile are happy being worker bees for their corporate masters, and don't mind dragging the rest of us along kicking and screaming. Welcome to the hive, y'all. If you give in, it'll only get worse - for you, your children, and everybody else. The only way to turn it around is to refuse, and simultaneously pressure your representatvies to outlaw these practices. Take a stand, people.