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.
brush texture is too consistent for it. Not enough blending and no bleeding between the colors. Just feels like someone popped open photoshop and scribbled, really