I don't know exactly but I've read that he relinquished his law degree just prior to his running for the presidency began. And also, Michelle Obambi relinquished hers also. Bill Clinton had to relinquish hid degree as part of his punishment for lying to the Grand Jury regarding hid Lweinskigate Scandal. We think Obambi turn his in due to the fact that he lied on the application by not disclosing an alias he has used, namely his REAL NAME, WHICH IS BARRY SOETTRO
http://www.snopes.com/politics/obama/birthers/occidental.asp