When the Tyrannosaurus manufacturer sues the merchant, its agent and a long-term impartial notary go to the retail store to purchase glasses, and then preserve the evidence to use it to sue the merchant. It is understood that Tyrannosaurus Eyewear is suing eyewear retailers across the country for trademark infringement. All the cases are exactly the same. Its agents and long-term impartial notaries go to retail stores to purchase glasses, and then preserve the evidence to use it to sue the merchants.