The Public Service Association says that thousands of public servants are at risk of losing their jobs under new rules that prevent temporary employees from working for more than four years with the same government agency.  The PSA has written to the Public Service Commissioner about the impact these changes will have on temporary employees unable to secure full time employment or a job with another agency by February next year when the new rule comes into affect.  Half of the full-time equivalent temporary employees have been working for more than four years and would be at risk of losing their job..