What are three main ethical principles that apply to psychological testing?

What are three main ethical principles that apply to psychological testing? Can I also get a description of each principle and how it practically applies to psychological testing.

I am not sure if this is right, but I do know what you mean.
I just copied this for you. However I know someone that might know and I will call them later and repost what they say. To help you better.

"The modifiers used in some of the standards of this Ethics Code (e.g., reasonably, appropriate, potentially) are included in the standards when they would (1) allow professional judgment on the part of psychologists, (2) eliminate injustice or inequality that would occur without the modifier, (3) ensure applicability across the broad range of activities conducted by psychologists, or (4) guard against a set of rigid rules that might be quickly outdated. As used in this Ethics Code, the term reasonable means the prevailing professional judgment of psychologists engaged in similar activities in similar circumstances, given the knowledge the psychologist had or should have had at the time."(http://www.apa.org/ethics/code/index.aspx)Source site.