Is There a Disclaimer in the Attorney General's Job Description?

Via CBS News:

AG Holder cleared in Justice gunwalking probe
 

Also, via the same article at CBS News:

 The inspector general found fault with the work of the senior ATF leadership, the ATF staff and U.S. attorney's office in Phoenix and senior officials of Justice's criminal division in Washington. He also said that poor internal information-gathering and drafting at Justice and ATF caused the department to initially misinform Congress about Fast and Furious.
 

So, since the Attorney General heads and oversees the Department of Justice, and the Department of Justice screwed the pooch...how is Attorney General Holder cleared of that incompetence?  He must have a disclaimer in his job description.  Good thing they never applied Sarbanes Oxley (2002) to goverment offices.