Random drug testing, also know as “spot” testing is a deterrant against drug users in the workplace because it is conducted on an unannounced basis. Using a random selection method, the employer can pick one or more employees to drug test without fear of bias and that all employees have an equal chance of being selected. 

Random drug testing is an effective tool against drugs in the workplace, because employees never know when they will be selected for testing. Random drug testing works well with Pre-employment testing which is designed to keep from hiring drug users in the first place. 

Employers should have their drug testing policies outlined in their employee handbook and should be openly shared with applicants and employees