Finance Minister Arun Jaitley today said, investigative agencies have to maintain the utmost level of professionalism and have to be guided by the sole purpose of detection of crime. <br />''<br />''Addressing the gathering on the occasion of 61st foundation day of Directorate of Revenue Intelligence (DRI) in New Delhi, the Minister expressed confidence that the department will continue to endeavour to maintain its high standards. <br />''<br />''He said, integrity and ethical standards go side by side with the highest level of professionalism and therefore it is those standards of an investigative agency on which its credibility depends.<br />''<br />