sentences:  The Metropolitan Police had recently been rocked by exposure of massive corruption in the Criminal Investigation Department, and Mark, with the famous pronouncement that "a good police force is one that catches more crooks than it employs", set about attempting to reform it.He changed disciplinary procedures, returned many detectives to uniform, made a number of television appearances praising the uniformed branch following student unrest and protests against the Vietnam War, and began to gather around him a group of loyal, ambitious uniformed officers who had not graduated from the old Hendon Police College.The uniformed branch began to gain precedence and CID was increasingly put under uniformed command.