Or maybe you're changing your existing policies. I heard poppy seeds even cause problems. I've had experience with two drug testing implementations in my working career. And at a 700-employee chemical plant, we sent four hourly employees to a drug rehabilitation program and one superintendent resigned rather than go to rehab.
Many reasons exist for drug testing.
In some industries it' s mandatory. Studies show that testing programs can increase safety and productivity, and reduce absenteeism and workers' comp costs. Most companies today have initiated some form of testing. One of the most popular programs, this type of testing screens prospective employees before they are hired. It's easy to administer since it's just one part of a total pre-employment physical.