Periodic Drug Testing is different from random drug testing, in that it is scheduled in advance periodically throughout the year. and is usually performed on current employees.
The drawback of periodic testing is that it is announced, scheduled test. This could allow the employee to discontinue drug test or take measures to dilute the testing process.
Periodic drug testing is not accepted as federal mandated practice. However, it still has its advvatages for private companies. It can assist in minimizing drug abusers who cannot stop. It is still an efffective alternative to no testing in the workplace,