https://ghostarchive.org/archive/eUCGy
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Edit
The artist couldn't have used any form of a computer or cell phone in the courtroom. To be sure - I googled NYC courtrooms.
No use of laptop computers or personal stereos [...] All beepers and cell phones must be turned off.
I assume the artist must have done quickie pencil (or whatever) sketch in the courtroom, left court, and used an app.
but are these good sketches because they look nice? Or because they accurately convey the moment, the emotions, the plot