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.
apossum