evidence: Victoria’s Secret, among other retailers, attaches the tags to online orders to track merchandise across its supply chain, Brooke Wilson, a company spokeswoman, said. It also is testing the tags to prevent theft, she added. [...] But while retailers say the technology helps them track inventory and stop theft, some consumer advocates are concerned about shopper privacy. Although the tags can be removed by customers once they leave the store and don’t by themselves allow stores to identify shoppers, privacy advocates are concerned that customers could be tracked in stores without consent. [...] However, retail security experts point out this technology is not very sophisticated. It does not allow retailers to broadly track a customers' whereabouts if they are wearing the clothes and cannot even help track items if they’re stolen or lost. Instead, RFID chips require specific reader guns to access the information contained in the tag and these reader guns only work from 10 to 30 feet away, said Dean Frew, the chief technology officer and senior vice president of RFID Solutions for SML Group. This would make it nearly impossible for the tags to be read by someone without a RFID gun from far away, he said.