Ahmedabad: Over the years, Gujarat, and India as a whole, have seen several methods to pass off fake notes as real ones, with some even making a business out of it. Senior city police officials said Ahmedabad police’s Special Operations Group (SOG) files cumulative cases periodically after seizing fake Indian currency notes (FICN) detected in the banking channels. “The highest denomination currency notes are often the most-used ones. After the discontinuation of bigger denominations, now Rs 500 is the biggest note, and thus the focus is on the note, along with the most circulated one – Rs 100. Notes of both the denominations have multiple security features that undergo scrutiny, and mostly the currency counting machine identifies the FICN,” said a senior official. “Often, the material of the note and its security features also flag the forgery.” An identification system developed by researchers at the National Forensic Sciences University (NFSU) takes a different approach by using technology — it uses the serial number on the currency note to check with a central database to flag all the instances where a specific number has featured on the suspected FICN list. A team primarily from NFSU was granted an Indian patent for the method of identification. “The proposed system maintains a comprehensive historical database of scanned entities by users, ensuring consistent and scalable verification. Its real-time alerts notify users and authorities promptly, enhancing responsiveness. Designed to be mobile-friendly, rapid and cost-effective, the technology can help in sectors such as banking, retail, logistics and law enforcement,” said a senior NFSU official. Sources said that govt agencies will now be approached for possible collaboration.