The CAS curriculum states: Ethical decisions arise in almost any CAS activity (for example, on the sports field, in musical composition, in relationships with others involved in service activities). Evidence of thinking about ethical issues can be shown in various ways, including journal entries and conversations with CAS advisers.
A very helpful guideline can be downloaded here thanks to Molly Peterson, Fairhope, Alabama USA: CAS Learning Outcome #7: consider the ethical implications