Please!!!!!!!!!
You can write all the ethics guidelines, document, memos, etc and they will accomplish very little. If you lack the personal ethics/morals/integrity that is required to do the job, you will have no problem not adhearing to a sheet of paper.
I agree with IRstuff, if management does not strictly enforce practices which violate company policy, then why should it expect employees to. Biggest problem is that it is often management that is violating the ethics policy, not the general employee.
Ethics can not be enforced... it is a part of one's character. If you are unethical to begin with, then there is nothing that can be done to change that.
jetmaker