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In all honesty, the number looks like something someone penned on him. It very well could be a temporary tattoo done with henna. Now, if his 'roommate' says he had a tattoo, then obviously something is amiss with the photos.

There's so many wanting it to be a conspiracy, I could see photoshopping and making the tat transparent.

Just my thoughts...I assure you, there are more questions than answers at this point.

I can see the conspiracy-pundits having discussions on this for decades. It is their inner-yen for truth that keeps people from being too trusting of the dialog of msm.

Peace.