 On behalf of Dershowitz , Harvard Law School dean Elena Kagan asked former Harvard president Derek Bok to investigate the assertion of plagiarism ; Bok exonerated Dershowitz of the charge . 
 On behalf of Dershowitz , Harvard Law School dean Elena Kagan asked former Harvard president Derek Bok to investigate the assertion of plagiarism ; Bok exonerated Dershowitz of the charge . 
On behalf of Dershowitz , Harvard Law schoo dean Elena Kagan asked former Harvard president Derek Bok to investigate the assertion of plagiarism ; Bok exonerated Dershowitz of the charge .