Ode of Ethics for Human Resource Training and Development Professionals

Although many organizations and progressional societies have their own specific codes of conduct, it seems that there is no single established code of ethics for human resource training and development professionals.

What does it mean to be an ethical training and development professional?
What ethical issues should trainers be mindful of
What legal and liability issues should trainers should be mindful of?
Do contract trainers and In-housetrainers face different ethical issues? if so, what?

Remember to focus reposes specifically on relevant aspects of training and development; these questions are intended to be more specific that a discussion of general employee or contractor ethics.