Deshawn behaves ethically at his job even when no coworkers or supervisors are watching. Deshawn is displaying integrity
What is integrity?
Integrity is the quality of being honest and fair. It is the quality of being consistent with what you say and do. DeMarcus is being honest with himself and with his coworkers when he behaves ethically even when no one is watching.
So Deshawn is also being fair to himself and to his coworkers by holding himself to the same high standards of behavior, regardless of the situation.