Professional boundaries "became blurred" at Scotland Yard as the force made "imprudent decisions" and showed "poor judgment" in hiring a former News of the World boss as a PR consultant, the police watchdog said today.
The Independent Police Complaints Commission ruled out corruption allegations in the decision to give Neil Wallis a £1,000-a-day job with the Metropolitan Police.
The investigation also dismissed claims of misconduct surrounding former assistant commissioner John Yates' alleged involvement in securing a job at the force for Mr Wallis' daughter.
But the two investigations showed "senior people appear to have been oblivious to the perception of conflict" amid the phone hacking scandal, as well as policies having been breached in some cases.
Senior figures at the force were to blame for failing to carry out a vetting check on Mr Wallis "prior to, or during, his employment" for communications advice between October 2009 and September 2010, the report said.
Mr Wallis was arrested and bailed last year as part of the force's investigation into phone-hacking.
Ms Glass expressed concern over the resignation last month of former Metropolitan Police communications chief Dick Fedorcio, who was told he had a case to answer over the procurement of the contract.
Ms Glass added: "The IPCC cannot prevent a member of police staff leaving before facing misconduct proceedings. But I can and do observe that such a practice can be hugely damaging to public confidence."