What is meant by a "zero-tolerance" policy?

A "zero-tolerance" policy refers to a strict prohibition against any drug or alcohol use within a certain context, often in the workplace or educational settings. This means that there is no allowable threshold for substance use; any use is met with predetermined consequences, regardless of the amount or context. Such policies are commonly implemented to ensure a safe and productive environment, as they aim to deter substance use entirely by establishing clear expectations and consequences. This approach is particularly important in situations where safety and performance are critical, such as in industries with high risks, like transportation or construction.

Other approaches, such as those suggesting limited use or flexibility, would not align with the fundamental principles of a zero-tolerance policy, which emphasizes complete prohibition without exception.