Rather than submit a person to drug testing, why not use the traditional method of checking references to find out about an potential employee?
Supervisors need to be trained to identify, confront, or refer impaired employees to Employee Assistance Programs or other intervention programs.
Impairment testing not only detects people who are impaired by drugs and alcohol, but also by sleep deprivation stress, fatigue, emotional problems including anxiety, sickness or other health problems, over-the counter medications, prescription medications, or those who are otherwise not able to perform safely. Impairment due to illicit drugs is statistically much less likely than impairment from other factors. These tests, once administered, can improve safety far better than drug tests can. They are not discriminatory. Rather, they measure everyone equally by their performance which is the most significant factor in employment.