In article , PeterN
wrote:

Yeah, but...what do you think of the P1000?

The ultimate private detective camera.

actually that would be an infrared camera.


Why?

because infrared light is not visible to humans, so a detective could
take photos in the dark, lit by infrared flash, and nobody would notice
anything unusual.

another use is forensics to detect forgeries or other anomalies.
https://kolarivision.com/articles/forensics/