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Too lazy to read 7 pages but in case it hasn't been covered...there is a difference in cameras...i.e. cameras in a dark environment only shoot black and white due to low light...I am no camera expert but I have seen a video from a camera that due to the low light showed a shirt to be a light almost white color when I saw the person wearing a black shirt. Not saying JJ did or didn't, just my observations. FWIW the different shirts on different cameras is not a good argument.

Security camera inside the bar was lit with infrared LEDs. you can't see the light they emit, it allows the use of security cameras where low light is desirable. Most digital cameras use an infrared cut filter over the sensor because IR messes up color rendition, security cameras in bars use this technology because it is inexpensive. Other cameras outside lit by ambient neon, hg-vapor, halogen headlights, etc.

Infrared reacts differently than you might expect on some surfaces, passes directly through some fabrics (cue pervs at the beach with "night vision" video cameras), green foliage reflects IR so strongly that it renders bright white. It is possible that the "dark" pigment in JJ's shirt (or additives in his laundry detergent) rendered it white to the security camera.

But how many times have you EVER heard police get search warrants and DNA tests for a fight outside a bar? The whole thing stinks of corruption and media hype. Stupid of JJ in particular to have been there in the first place, it's tough being a celebrity in a small town... the microscope of scrutiny.