One of every 10 Wal-Mart employees in California isn't being paid for missed breaks, violating a state law that requires they get an extra hour of wages, attorney Jessica Grant said at a hearing before Judge Ronald Sabraw in Alameda County Superior Court in Oakland. Wal- Mart knew as far back as 1998 that workers couldn't take breaks because of understaffing, so the company stopped requiring them to clock in and out of rest periods to conceal evidence, she alleged.