It is critical for all businesses and in some cases required for others that you share your policies pertaining to Ethics and Compliance. In general, you should do so in writing via your Employee Handbook or in some cases via a separate document. Be clear in what you expect while still allowing for company interpretation. Overall, insure that you give the employee a chance via one-on-one or group sessions to review the policies so that they are clearly understood. Lastly, get employees to sign off indicating the policies were read and that the employee agrees to adhere to them.