Maybe an IR camera and an IR spotlight? Then they wouldn't feel like they were lit when they tore the sign down.
This
.mpg (11.2MB) shows a kid tagger stopping to write on the back of the left vehicle.
The BW camera is one that is "good" in low light and has a high IR sensitivity. There is also an led IR panel flooding providing illumination. That illumination falls off about half way down the vehicles.
There was some degradation in the transfer to mpeg, but I couldn't have id'd the kid from the original.
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