ahh I see. Thanks Qublai Khan. I was having a tough time googling it.
I have one more question regarding this. I checked principles and in addition to the ethics principles it seems that there are few principles (I am still searching) for specific steps. For instance there is a Locard exchange principle for crime scene investigation. I am sure there will be more for every step like evidence preservation and victim interview or any other step. I just don't know others besides ethics and Locard's. What do you think about that?

Off the topic: I read "The guide" by R.K.Narayan as per your suggestion and it was incredible. You were right. I finished it in one sitting, I couldn't put it down. Thank you for that suggestion. You have great taste.

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...Planet Earth is blue
And there's nothing I can do.