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By:

Dr. Keshav Kumar

3 February 2025 at 7:36:17 am

The Science of Gait Analysis

As facial recognition reaches its limits, the science of how we walk is emerging as a powerful new tool in forensic investigation. In today’s world, where surveillance cameras are present everywhere, identifying a suspect is no longer restricted to only fingerprints and facial recognition. Modern forensic science has shown that the way a person walks provides valuable evidence during a criminal investigation. This unique walking pattern, known as gait, has emerged as a valuable behavioural...

The Science of Gait Analysis

As facial recognition reaches its limits, the science of how we walk is emerging as a powerful new tool in forensic investigation. In today’s world, where surveillance cameras are present everywhere, identifying a suspect is no longer restricted to only fingerprints and facial recognition. Modern forensic science has shown that the way a person walks provides valuable evidence during a criminal investigation. This unique walking pattern, known as gait, has emerged as a valuable behavioural biometric. By analysing gait from CCTV footage, forensic experts help investigators identify suspects, particularly when other methods of identification are unavailable. This makes gait analysis useful in cases involving masked offenders like kidnappings, murders, robberies, terrorist attacks and other crimes captured on surveillance cameras. Although gait analysis is now an important forensic tool, it originated in the medical field, where doctors studied walking patterns to diagnose movement disorders. Over time, researchers discovered that every individual has unique walking patterns, influenced by their age, height, body structure, injuries, habits, and footwear. Advances in video technology, computer-based analysis, and artificial intelligence have transformed gait analysis into an important scientific tool in criminal investigations. Notable Cases India has witnessed several notable cases in which gait analysis played a key role in criminal investigations. One of the most notable examples is the 2021 Saki Naka rape and murder case in Mumbai. The CCTV footage captured the accused's body movements near the crime scene. As facial recognition alone was insufficient, forensic experts compared the accused's walking patterns with the individual seen in the footage. The gait analysis report, along with CCTV evidence, witness statements and other findings, strengthened the prosecution’s case. Rather than serving as a standalone proof, gait analysis acted as corroborative evidence. Recently, during the investigation of the 2026 Ketan Agarwal murder case in Pune, investigators compared the accused’s gait with CCTV footage, as the suspect’s face was allegedly hidden with a hoodie. Investigators recreated the suspect’s walk under similar conditions to compare it with CCTV footage, highlighting how gait analysis is becoming a valuable investigative source in India when traditional methods of identification are limited. In State of Tamil Nadu v. Ponnusamy (2026 INSC 507), the Supreme Court observed that Gait analysis is a useful scientific technique for identifying suspects; however, the court also clarified that gait analysis should not be treated as the only evidence but rather should be used alongside CCTV footage, witness testimony, and other forensic findings. This approach encourages the use of scientific evidence while protecting the fairness and credibility of the judicial process. Recent scientific research highlights advanced forensic gait analysis through artificial intelligence, machine learning, and deep learning. Unlike fingerprints or facial features, gait can remain useful even when a suspect’s face is concealed or the image quality is poor. By examining factors such as stride length, walking speed, body movement and the timing of each step, experts can identify patterns that may help establish whether two video recordings show the same individual. Modern systems combine spatiotemporal and biomechanical gait measurements for analysing walking patterns, even from low-quality CCTV footage, which makes gait analysis faster, more accurate, and increases its value in criminal investigation. The growing importance of forensic gait analysis highlights the work of experts and institutions across the world. In India, experts such as Dr. T.D. Dogra and Dr. B.R. Sharma made remarkable contributions in the field of forensic science. Internationally, Professor Mark S. Nixon pioneered gait recognition research. Government organisations such as the Directorate of Forensic Science Services (DFSS), Central Forensic Science Laboratories (CFSLs), and the National Forensic Sciences University (NFSU), along with private organisations like Truth Labs, support research and the use of modern forensic technologies in criminal investigations. As forensic science continues to emerge, gait analysis opens up with new possibilities in solving crimes and delivering justice. While it only serves as one piece of the puzzle, it provides valuable clues when used with other evidence. After all, every step has a story to tell, and sometimes, that story leads investigators to the truth. (Writers are experts in forensic matters. Views personal.)

India waits to lasso diamantaire Mehul Choksi

Quaid Najmi
Apr 14, 2025
5 min read

Mumbai: India rubbed its hands gleefully as the Belgium Police honoured its request to arrest the absconder diamantaire Mehul Chinubhai Choksi – more than seven years after he, along with his nephew Nirav Deepak Modi - allegedly duped the Punjab National Bank of nearly Rs. 13,800-crores.

 

The scam involving the ‘Mehul Mama-Nirav Bhanja’ erupted in Jan 2018, after the PNB lodged a complaint with the Central Bureau of Investigation (CBI).

 

By then the kin, along with many of their family members, winked and slipped out of the country, leaving a rattled India rubbing its palms in disappointment.

 

A political-cum-financial storm raged, embarrassing the Bharatiya Janata Party government of Prime Minister Narendra Modi a year before the Lok Sabha elections.

 

Multiple agencies launched a multi-pronged probe into what became the biggest banking scam in the past quarter century – and almost four times bigger than the stock market-cum-banking fraud the late Big Bull Harshad Mehta had inflicted on the Indian economy 33 years ago (in April 1992) – when it was just opening up.

 

In Belgium

According to official reports, Choksi was living with his Belgium citizen-wife Preeti in Antwerp, a global diamond hub, presumably for the past 18 months on a ‘residency permit’ acquired through questionable means, for medical reasons.

 

Earlier, he shot to the headers (June 2021) while being taken in a wheelchair to a court by the Dominican Republic's Police on charges of sneaking into the small country in the Caribbean Sea, North America.

 

Interestingly, as the Antigua & Barbuda government initiated the process to cancel his citizenship acquired through an investor visa, Choksi had suddenly gone ‘missing’ till he surfaced in the Dominican Republic.

 

The April 2025 action by Belgium followed a request by India’s CBI and the financial frauds specialist Enforcement Directorate (ED) to nab Choksi as the InterPol had revoked his Red Corner Notice in 2023.

 

Mama and Bhanja

‘Mama’ Choksi is the founder-owner of Gitanjali Group while ‘bhanja’ Nirav’s Firestar plus other companies – and the duo, with some PNB officials hand-in-glove – conspired to make a ‘mamu’ of not only PNB, but other banks, as it subsequently tumbled out.

 

After making a quiet exit, Choksi was detected living in the verdant Antigua & Barbuda Isles (West Indies), then attempted entry to the Dominican Republic, was sent back to Antigua & Barbuda and then went to Belgium where he was nabbed on Sunday.

 

Similarly, Modi was found sauntering on the streets of London and nabbed in March 2019. He remains in jail there since India's extradition is still pending.

 

However, India is keeping its fingers crossed that it may finally lay hands on Choksi, bring him to India and face trial in the PNB scam, though it may take time.

 

Born in Mumbai (1959) and educated in Gujarat, Choksi, 66, and wife Preeti have three children.

 

The Rs. 13,800-crore PNB scam

In the modus operandi revealed after India’s second-largest PSU bank PNB admitted it was scammed, Choksi and Modi used fraudulent Letters of Undertaking (LoU) to get overseas credits or loans from Indian banks.

 

The PNB first informed the Reserve Bank of India (RBI) of the fraud and then lodged a criminal complaint with the CBI in Jan. 2018, plus another CBI complaint in Feb, that led to a FIR against Modi and Choksi and their companies.

 

The ED entered the scene to probe the allegations of money-laundering through the LoUs – which they allegedly misused to avail short-term business finances from foreign branches of Indian banks.

 

The probe said that the duo were availing the LoUs from the PNB’s Brady House Branch from March 2011, and over the next six-seven years, managed to get a whopping 1,200-plus LoUs like a breeze with the help of some friendly bankers within.

 

Post-scam, the gold-diamond companies Gitanjali Group and Firestone Group with multiple operations in India and abroad have largely wound up, while some personal assets of the mama-bhanja have been auctioned to recover a part of the dues.

 

ED's plea to declare Choksi fugitive stuck for seven years

Even as absconding diamantaire Mehul Choksi, a key accused in the Punjab National Bank loan fraud case, has been arrested in Belgium, the ED's plea to declare him a fugitive economic offender has been pending before a court in Mumbai for nearly seven years.


Choksi, 65, and his nephew diamantaire Nirav Modi are the prime accused in the Rs 13,000 crore PNB bank loan fraud case. Choksi was arrested in Belgium following an extradition request by Indian probe agencies, official sources said on Monday.


The Enforcement Directorate had filed the application in July 2018, seeking to declare Choksi an FEO and confiscate his assets under provisions of the Fugitive Economic Offenders Act.


However, the matter has witnessed repeated delays owing to a barrage of applications filed by the accused in the PMLA court and the Bombay High Court alleging procedural lapses in the Enforcement Directorate's plea.


"The court is kept busy with frivolous applications, and hearing on our application to declare him (Choksi) an FEO has been adjourned for the past seven years,” an ED officer had said after the hearing was once again deferred this February.


"The court should have continued the hearing and taken a decision on the future course of action once the application was moved," the officer had said.

He had urged the court to take note of the repeated filing of similar applications and to not entertain them.


Choksi's lawyer had informed the court that the accused was undergoing treatment for suspected cancer in Belgium and intended to file an application in connection with his health.


Under the FEO Act, an individual can be declared a Fugitive Economic Offender if a warrant has been issued against him for an offence involving Rs 100 crore or more and he has left India while refusing to return. Once declared an FEO, the person's property can be confiscated by the investigating agency.


Choksi had challenged the ED's application in the Bombay High Court, alleging that the agency "had not followed proper procedure before filing the application and, hence, it stands vitiated".


However, in September 2023, the High Court dismissed his plea, ruling that the ED had adhered to the prescribed format under the FEO Act. It also vacated a stay on the special court's proceedings.


Despite this, the hearing on declaring Choksi FEO could not commence, with Choksi continuing to file applications before the special court through his lawyers.


While most of these pleas have been dismissed, a few remain pending. His latest attempt to stall proceedings through a plea to recall the notice issued on the ED's FEO application was rejected in December 2023.


According to ED officials, Choksi left India under suspicious circumstances in early January 2018.


Shifting stance

Choksi's counsel has argued that the ED kept shifting its stance on the material grounds for declaring him an FEO and that the suspension of his Indian passport made it impossible for him to return for investigation.

The court, however, rejected this argument, stating that the notice was issued based on accurate information and not based on "wrong facts or mistaken assumptions".


ED claimed the accused left the country under suspicious circumstances in the first week of January 2018.


Nirav Modi has already been declared as an FEO by the special court. He has been lodged in jail in London since 2019.

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