Kumar Kibble, a special agent in charge at Homeland Security Investigations, says producing and selling fake merchandise is intellectual property theft.
"You've got consumers that are going to be cheated," Kibble said. "Profits are stolen from the American business. For those reasons we remain very concerned."
Authentic NFL merchandise will have a hologram on it. However, Kibble says that some knockoffs are so good that even the holograms can be counterfeited.
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