The hand on the left is visible due to the presence of explosive material. The hand on the right does not show up at all.
REDXDefense's portable XPAK
May 23, 2007 One of the telltale signs of an explosive crate, envelope or package is the tiny trace amounts of explosive chemicals the bomb-maker leaves on the outer of the package when he closes it. Trace quantities of explosives are very hard to wash off hands as well, which is the theory behind the XPAK, a new portable explosives detection unit that allows shipping officers and security personnel to quickly scan for trace quantities of explosives in the field.
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