Which of the following reasons can lead to the revocation or suspension of a hoisting license?

Operating machinery under the influence is a significant reason for the revocation or suspension of a hoisting license. This reflects the serious safety implications of impaired operation. When an operator is under the influence of alcohol or drugs, their ability to make safe and sound decisions is compromised, increasing the risk of accidents and injuries not only to themselves but also to others on the job site. Maintaining a safe working environment is paramount in the construction and heavy machinery operation industries, which is why strict regulations are enforced regarding substance use.

In contrast, while factors such as improper issuance or issues with training attendance might raise concerns or potentially lead to disciplinary actions, these do not pose the same immediate danger to safety as operating under the influence. Therefore, the gravity of the infraction associated with operating machinery while impaired underscores why this would be a key reason for license suspension or revocation.