“Periodicity” is used to refer to how often employees get tested. For example, every month or every quarter. Every pool has a testing rate – which is the number of random testing performed annually. Rates usually range from 10 to 50%. In the case of a 50% rate, one-half the total number of employees in the pool random test is performed annually. This is not the same as testing the 50% of employees in the pool! Remember, employees are selected randomly which means there is a possibility some employees are selected more than once and others not selected at all but at the end of the year, enough test would have been conducted to equal 1/2 of the total number of people in the pool. The larger the pool, the smaller the chances of a repeat test.

The federal Department of Transportation (DOT) recommends testing rates of 10 to 50% depending on the type of work.

Posted in: Random Testing Consortium