Which of the following actions is considered prohibited conduct under the Substance Abuse and Alcohol Testing Program?

In the context of the Substance Abuse and Alcohol Testing Program, reporting to duty with a breath alcohol concentration of 0.04 or greater is deemed prohibited conduct. This is because a breath alcohol concentration at this level shows that an individual is impaired and poses a safety risk not only to themselves but also to their colleagues and the public. The policy mandates strict adherence to alcohol limits to maintain a safe and effective working environment, especially in roles that involve significant responsibilities like those in law enforcement and public safety.

In contrast, reporting with a breath alcohol concentration below the prohibited level, filing a complaint with human resources, or voluntarily taking a drug test do not violate the program's regulations. These actions either demonstrate compliance with the policies or involve procedural rights that employees have in the workplace. Therefore, only the action related to being at or above the specified alcohol concentration threshold is classified as prohibited conduct within this framework.