Final answer:
The principle of justice in APA Ethical Standards promotes equitable and fair distribution of healthcare. It requires similar treatment of patients in relevant circumstances and fair treatment of all participants in research trials.
Step-by-step explanation:
One of the General Principles of the APA Ethical Standards is Principle D: Justice. The principle of justice states that the distribution and practice of healthcare should be equitable and fair. In clinical settings, patients should be treated similarly in relevant circumstances, and similar cases should be treated similarly. In research trials, justice requires fair treatment of all participants and unbiased trial design and participation requirements. Researchers should not give special treatment to certain participants or discriminate against others.