Drug and alcohol testing is a very complicated are of the law, but I'll give you some general information which I hope will help you. In the U.S., drug and alcohol testing really began when the Congress passed the "Drug Free Workplace Act of 1988." The Department of Transportation then published regulations to implement the law. These regulations covered the trucking, maritime, pipeline and other industries which were already subject to various federal safety standards. The requirements of the law also apply to federal contractors, so many private companies have to comply. Therefore, many private companies adopted policies prohibiting the use, possession, sale, etc. of drugs in the workplace, and as a part of those policies required employees to have drug tests.
Generally - and this is only a general statement - drug tests fall into one of 3 categories; a) "post-offer" testing which is given as part of a physical exam after a job offer is made but before the applicant begins work, b) "for cause" testing which is done when the employer has a "reasonable, good faith objective suspicion" an employee has violated the policy, often in connection with an accident or "near miss," and c) "random" testing.
OK, so an employer can test after a job offer is made and where there is "good cause" to believe an employee is in violation of the drug policy. If the employer is in the transportation industry, gas industry, maritime industry, etc., or in private industry where the job is "safety sensitive" the employer may (in fact in some industries, has to) require employees to take "random" tests.
So, let's get to your specific questions. An employer can require employees to undergo testing even if there was no drug test required at the time of employment. Many employers do not require "post offer" drug tests, but DO require "for cause" or "random" testing under their policies. Also, if an employer does not have a drug and alcohol policy it may decide to implement one. If that happens, the policy will probably cover all employees whether they had a post offer drug test or not. Who is covered, and under what circumstances, depends on the language of the policy.
Finally, not every employee has to be tested. Whether or not every employee is tested depends on the policy the company has. If the company does not require "post offer" drug tests, but has a policy requiring random tests, the employees names will be "drawn" on a random basis. This means that some employees may be tested more than once during a testing period, and some may not be tested at all. Also, "for cause" testing will be done only when the circumstances create a "reasonable, good faith objective belief" that the employee should be tested. A worker who dents a fender on a company truck may not be tested while one who hits a building with a fork lift may. It depends on a variety of factors.
Finally, if the company is unionized any drug and alcohol policy - including the testing - has to be negotiated with the union. Further, many states have laws which restrict testing or otherwise impact the company's right to test employees....
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