Excerpt: Federal and state investigators have questioned at least 15 of the more than 60 investment firms that help manage money for California's state pension system about their trading, state documents show.... Up to now, CalPERS has not disclosed results of its survey. However, in response to a Public Records Act request by The [San Francisco] Chronicle, CalPERS provided the letters it received from 59 money managers that replied to its questionnaires.  MORE >>