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?

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.

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

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

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