"Department(police), which helps in improving image of the government can also damage it. One mistake overshadows all the good work," he said.
Yadav, while addressing police officers and employees at a function organised here to lay the foundation stone of 'police bhawan', said police was the most important department of the state.
"I do not want to go into the details... I have indicated it during the recent IPS week programme. You have carried out some very good work but some things have also taken place which we have not been able to justify," he said.
Congratulating the Director General of Police Rizwan Ahmed, Yadav said the DGP is giving the force a good building as a parting gift before his retirement slated for this month end.