I was tested when I got my job...but its against my contract to have random drug tests...
My father worked for the post office and he would walk into work and be told to pee...totally random...
but this idea bothers me...I really think it violates the 4th Amendment
'The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized. '