Excerpt: [P]rivate companies have been inundated with requests for help with the paperwork. To qualify for both their state pension and Social Security benefits, teachers must work at least one day at any of the handful of school districts across the state that pay into both systems. Over the past year, the Houston-based firm of Martin & Associates has helped more than 3,000 retiring teachers find such temporary placements for a $700 fee.  MORE >>