Certified Accounts

Hi , wondering is there a table in OI that contains info about certified accounts. Attestation case contains that info however I am looking for a table or may be walk between the tables to fetch only certified accounts. e.g I have 1000 accounts in system , 700 accounts have been through attestation campaign.  I believe there must be a table that contain only certified accounts (other than attestation case/history). RiskIndex  on the accounts is calculated on the bases if the account is certified or not, I am not able to figure out how this calculation is happening , thanks in advance