After discovering discrepancies and missing controlled substances, the nursing supervisor determines that a valued, experienced staff nurse is responsible. Which actions should the nursing supervisor take? (Select all that apply.)

A) Refer the nurse to a peer assistance program.
B) Confront the nurse in the presence of a witness.
C) Immediately terminate the nurse's employment.
D) Relieve the nurse of responsibilities for patient care.
E) Require the nurse to undergo immediate drug testing.