Preemployment drug testing can be a useful hiring tool for certain jobs and in certain industries and generally is permitted as a matter of law.
Employers implementing a drug testing regime must still adhere to certain standards such as administering the tests consistently and in a nondiscriminatory manner.
While marijuana use generally does not excuse a failed drug test, employers must proceed cautiously as the law is evolving in this area with respect to valid medical marijuana users in certain states.