Follow your organization's fitness-for-duty policy and its procedures if you have one. It is designed to provide reasonable assurance that employees can perform their tasks in a reliable manner, that they are not under the influence of any substance, legal or illegal, that may impair their ability to perform, and are not mentally or physically impaired from any cause that can adversely affect their ability to competently perform their duties.
1. Are you aware that you are slurring your speech and appear unsteady on your feet?
2. Do you realize that you were yelling loudly and throwing tools across the room?
3. Why did you threaten to break the window and 'hurt somebody'?