We are learning more about the massive data breach at Target. the retail giant is facing lawsuits from customers, but security experts say the company shouldn't be blamed. The Justice Department and the Secret Service are investigating. Hackers stole an estimated 40 million debit and credit card numbers. Now, a dozen of those customers are filing lawsuits, saying Target failed to maintain "reasonable security procedures." The Wall Street Journal reports that sales at Target dipped slightly over the weekend. But Target is telling customers they won't be liable for fraudulent charges, and free credit monitoring will be provided for those effected. Many security experts say that Target should not be blamed for the breach. But some experts say the latest security standards are not effective against sophisticated hackers because the US still relies on magnetic strips, which are easy to copy. No one knows exactly how this data breach happened yet.