why do not brand name everybody to hold an occasional drug peak?

why do not brand name everybody to hold an occasional drug peak?
In my country, it's usually done prior to employment and renewal of driver's license but they just can't blind you anytime they want unless there is really rationale to suspect drug abuse and even later it requires your written permission to do so, protects an individual's right to privacy.
Unless suspicion of drug use, it is classed as an invasion of privacy.
I do not spell America near a K. Thats why. Oh and then why not generate everybody .. occasionally. Then after that it would be so easy to capture everyone to do .. when we tell them. If you want your choices made for you please be aware of free to find a place that will make them for you. So you can budge pee in thier cups.
you penny-pinching, Doctors and Nurses, Firemen and Policemen, Politicians and School Teachers, Pilots and Bus Drivers, etc. etc.?.hmmmm, wonder who would oppose that.