Your employees need to be informed of the company's rules.  A company policy should be a set of statements agreed by management on how elements of a business will be implemented.  It avoids misunderstandings by staff. Such a policy is outlined in this document.

Areas covered in this document include the recording of personal information, reporting accidents, smoking, how visitors are treated, phone calls, computer use, punctuality, attendance, driving, and what disciplinary action would be taken for what incident or behaviour.

This can be a stand alone document or added to the employee handbook or manual.