It has necessitated for the Banks to deploy such authenticators which can support Banks to comply RBI guidelines concerning to fake notes detection. The machine should be 100% accurate in detection of Fake Notes. No fake note should pass as genuine in all case, have been the bottom lines for any machine which functions as authenticator unless  the note  is  of extremely bad quality.

The extremely bad quality of note should be rejected by the authenticators with error codes “No judgment” since the TRUE validity of such notes due to bad quality can not be judged except at forensic lab. Such bad quality of notes generally reflects overlapping of features of genuine & fake note creating, uncertainty of accurate validation even though best authenticators for not permitting deep scanning of such notes.

1.  No sorter or Currency Verification Systems (CVS) possesses any separate pocket to separate fake notes except pockets for separating notes of opposite criterion. Sorters just separate the notes which are not matching with the sorting criterion set in the machine. Fit & unfit, oriented and non oriented, face up & face down, X denomination and non X denomination, Y design & non Y design, etc. There are pockets for collecting opposite criterion notes but no separate pocket have been there for collection of fake notes; although it has been claimed that sorters are best suited for fake note detection. It is wrongly presumed that the opposite criterion pocket collect the fake notes. There is every chance that fake notes matching the various set criterion as may be set in the sorter will pass under such set criterion for many technical reasons. 
2. The functions of AUTHENTICATION & SORTING are two mutually exclusive functions      carrying wide difference in their respective weight ages and money values involved in the respective operations.  Imperfect   quality sorting of notes does not attracts loss of value while as passing fake notes as genuine attracts direct loss of value and criminal procedures under I PC and other provisions.
3. Authentication function needs detailed analyses of chemical & physical properties of Bank Note Paper, varied inks, resins, security threads, chemical used in the printing process. It includes checking of all security features on the face of the notes images, emblems, portraits, logos, colors, designs, texts, covert and overt features etc
4. Most accurate authenticity check only is possible if the notes are checked length wise. Authenticators must have capacity to scan the notes length wise back to back, to match with the large number of length wise prints, texts, emblems, portraits, horizontal lines; patterns etc for checking the continuity of such security features while as sorters are checking the notes width wise loosing the continuity of scanning various lengthwise security features.  Most of the security features in any currency types are designed length wise and hence without lengthwise scanning of the notes scientifically difficult to obtained 100% accuracy during the detection of fake notes. Most of the note counting /sorting machines in the international market have failed to offer  100% authentication accuracy for not having facility to check notes length wise and scanning the notes width wise, as also have been dependent on light & image based technology scanning the notes width wise, which have been scientifically unfeasible.   
5. It is scientifically impossible to check highly complicated, inter related security aspects in the notes with inter related large numbers of permutations and combinations of each and every  elements that constitutes a Genuine notes at  the  high speeds of sorters which sorts the notes with Image & light sensor based technology. Speed kills the authentication accuracy by note getting scientific time to pip into the minute differences between genuine and fabricated security features. At the most can detect very poorly fabricated notes but not skillfully fabricated fake notes being pumped in our country by other state supports that have   been having total infrastructures and notes printing technology
6. Authentication can only be carried out with high end light cum Image cum digital technology. It requires 0.6 to 0.7 seconds per note in our machine which is fastest on the glob.
7. The fastest fake note detector that is available in the international market takes minimum 3 seconds for thorough checking of notes. Such machines mostly have facility for single note manual feedings. Our machine has automatic feeder for one by one feeding of maximum 100 notes that takes 60~ 70 seconds and checks the notes length wise as needed for accuracy of authentication.   
8. Currency Sorter or Currency Verification Systems (CVS) machines have been meant for fitness sorting and not for authenticity checks and have not been equipped with digital technology but fundamentally dependent on light & image technology operating with high speeds of 4 seconds for 100 notes just checking over all designs and images on the notes without piping into the intricate aspects involved in real security features of the notes.