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.