A nurse manager is reviewing a recent client report related to a staff nurse. Which of the following behaviors by a nurse at work might be red flags for a substance use disorder?

Increased irritability towards supervisors, outspokenness regarding work issues, increased attendance at staff meetings.

Crying, sharing personal details of relationship problems, monopolizing conversations.

Volunteering for overtime on a continual basis, avoiding having a witness to wasting narcotics, needing to be alone in the medication room when preparing medications.

Increased cheerfulness, increased energy, helping other nurses on the shift.