A U.S. District Court judge is set to decide this week whether Hannaford Bros. supermarket chain can be held liable for a 2008 breach that exposed some 4.2 million credit and debit card numbers. According to a report Thursday in the Portland (Maine) Press Herald, the company was sued by plaintiffs from several states, and the complaints were consolidated last summer into one lawsuit. Judge D. Brock Hornby will decide whether to certify the case as a class action, which would allow the suit to move toward trial. — DK