"A Fair Witness is prohibited from drawing conclusions about what they observe."
Speaking as a photographer, not a scientist, we all make some from what we observe. We make choices. Choices on subject, how we compose to when we press the shutter... beginning with what camera we use, what film, etc., etc.. I don't believe one can be a casual witness to anything anymore.
wit·ness
[wit-nis] Show IPA
verb (used with object)
1. to see, hear, or know by personal presence and perception: to witness an accident.
2. to be present at (an occurrence) as a formal witness, spectator, bystander, etc.: She witnessed our wedding.
3. to bear witness to; testify to; give or afford evidence of.
4. to attest by one's signature: He witnessed her will.
verb (used without object)
5. to bear witness; testify; give or afford evidence.
noun
6. an individual who, being present, personally sees or perceives a thing; a beholder, spectator, or eyewitness.
7. a person or thing that affords evidence.
8. a person who gives testimony, as in a court of law.
9. a person who signs a document attesting the genuineness of its execution.
10. testimony or evidence: to bear witness to her suffering.
As a photographic witness, one is making conscientious, conscious decisions. A conclusion is the photograph.
Forgive me, I am trying to make a point and I am not sure it is coming through. I am only using David's title to his book as an example. It just made me think. It is not to denigrate his work or philosophy.