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.
Meh, this is just one mediocre artist. The art form isn't dying, there are plenty of skilled artists putting out good courtroom sketches.
Don’t forget
Junior!
but are these good sketches because they look nice? Or because they accurately convey the moment, the emotions, the plot