News Excerpt: 

The Central Bureau of Investigation (CBI) is likely to issue a Blue Corner notice against absconding Janata Dal (Secular) MP Prajwal Revanna.

About Interpol’s colour-coded notices

• A Blue or a Blue Corner notice is a part of Interpol’s elaborate system of colour-coded notices, which, according to the organisation’s website, enable countries to “share alerts and requests for information [on wanted persons/crimes] worldwide”.
• There are seven types of notices — Red Notice, Yellow Notice, Blue Notice, Black Notice, Green Notice, Orange Notice, and Purple Notice. Each has a different implication.
• Red Notice: To seek the location and arrest of persons wanted for prosecution or to serve a sentence.
• Yellow Notice: To help locate missing persons, often minors, or to help identify persons who are unable to identify themselves.
• Blue Notice: To collect additional information about a person’s identity, location or activities in relation to a criminal investigation.
• Black Notice: To seek information on unidentified bodies.
• Green Notice: To provide warning about a person’s criminal activities, where the person is considered to be a possible threat to public safety.
• Orange Notice: To warn of an event, a person, an object or a process representing a serious and imminent threat to public safety.
• Purple Notice: To seek or provide information on modus operandi, objects, devices and concealment methods used by criminals.
• These notices are issued by the Interpol’s General Secretariat at the request of a member country’s Interpol National Central Bureau, and are made available for all member countries. 
• The International Criminal Police Organization, commonly known as Interpol, facilitates worldwide police cooperation and crime control. 
• Based out of Lyon, France, it is the world’s largest international police organisation.

About Blue Corner notice

• At this point of time, a Blue notice is simply to further the investigating agencies’ enquiries.
• The CBI website refers to them as ‘B Series (Blue) Notices’ or “enquiry notices” which are issued 
• to have someone’s identity verified;
• to obtain particulars of a person’s criminal record; 
• to locate someone who is missing or is an identified or unidentified international criminal or is wanted for a violation of ordinary criminal law
• whose extradition may be requested.
• Blue notices are issued prior to or immediately after the filing of criminal charges,
• Red notices, which request the arrest of a fugitive, generally follow criminal convictions.
• All Interpol’s notices are completely discretionary, i.e. Interpol itself cannot compel law enforcement authorities to act on a particular notice. 
• Actual action on the notices is predicated on the relations between the two countries. 
• In 2020, Interpol issued a Blue Notice to locate fugitive Godman Nithyananda, who had fled the country amidst allegations of sexual abuse and rape in 2019.