theodp writes "All 120 Super Bowl XL footballs will be marked with a drop of synthetic DNA to thwart potential counterfeiters (free reg. required to read) who might be tempted to sell phony game-used Super Bowl footballs, which can be worth thousands of dollars. Exposed to a specific laser frequency, the DNA glows to a bright green. 'The chance of replicating this exact DNA sequence is one in 33 trillion,' said the president of PSA/DNA Authentication Services."
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