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In theory, when the dye pack explodes, it is supposed to stain the robber, making it easy to identify him.
But when the dye pack explodes on the Blue Man Group, no one even notices, and they walk away undetected. After one recent robbery in downtown Las Vegas, the dye pack exploded seconds after members of the Blue Man Group stepped outside the bank, spewing blue ink all over them. Nevertheless, they continued to walk the streets as if nothing happened, and tourists and passers-by even stopped them for their autographs.
The inability to nab the crooks has left police seeing red and feeling blue.