Three accused in the NEET paper leak case seek court permission for voluntary polygraph and brain mapping tests; Delhi fast-track court asks CBI to respond on maintainability and legal implications.
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In a significant development in the ongoing NEET paper leak investigation, a Delhi fast-track court has asked the Central Bureau of Investigation (CBI) to respond to a plea by three accused who want to voluntarily undergo a lie detector test and brain mapping. The plea, filed by Mangal Lal Biwal, Dinesh Biwal, and Vikas Biwal, seeks court permission for a polygraph test and Brain Electrical Activation Profile (BEAP) examination, also known as brain mapping, as part of their effort to assert their innocence and cooperate with the probe.
The court, which is handling the high-profile NEET case on a day-to-day basis, issued the direction on Tuesday, August 4, 2026, after hearing arguments on the maintainability of the application. The accused have claimed that their request for the court’s permission for the test and examination was made “voluntarily, without any coercion” to “demonstrate their bona fides” and assist the agency to conduct a “fair and transparent investigation”.
Why do the accused want lie detector and brain mapping tests?
The three accused have moved the application in the hope that scientific tests like polygraph and brain mapping will help establish their version of events and clear their names in the NEET paper leak case. In their plea, they have argued that undergoing these tests would show their willingness to cooperate with the investigation and demonstrate that they are not attempting to mislead the agency or the court.
Polygraph tests measure physiological responses such as heart rate, blood pressure and respiration while a person answers questions, with the theory that deceptive answers trigger measurable stress. Brain mapping, or BEAP, records electrical activity in the brain in response to specific stimuli, with proponents claiming it can reveal whether a person has experiential knowledge of certain details. This story was also covered by The Hindu.
However, the legal admissibility and evidentiary value of such tests in India are limited. The Supreme Court, in the 2010 Selvi v. State of Karnataka judgement, held that involuntary administration of these tests violates fundamental rights but left open the possibility of voluntary tests with judicial oversight. Even then, the results are not considered conclusive proof and are typically treated as investigative aids rather than standalone evidence.
Yeh issue kaafi important hai because it touches on the balance between an accused’s desire to prove innocence and the legal limits of scientific evidence in criminal trials.
Statements from the plea and legal position
According to the plea, the request for the court’s permission for the test and examination was made “voluntarily, without any coercion” to “demonstrate their bona fides” and assist the agency to conduct a “fair and transparent investigation”. The accused have emphasised that they are not seeking to force the CBI to rely solely on these tests but rather to use them as part of a broader set of evidence to support their defence.
The CBI, for its part, is expected to examine the legal and investigative implications before filing its response. The agency may argue that such tests, even if voluntary, cannot replace traditional evidence like documents, digital records and witness testimony. It may also raise concerns about setting a precedent where accused persons in high-profile cases demand scientific tests to influence public perception or judicial proceedings.
The court will now have to weigh the accused’s right to a fair defence against the established legal framework that limits the evidentiary value of polygraph and brain-mapping tests.
Background and context
The NEET paper leak case has been one of the most closely watched criminal investigations in India, given the exam’s role in determining admissions to medical colleges across the country. The leak, which came to light in early 2026, triggered protests by students and demands for a re-examination and a CBI probe into the modus operandi and the people involved.
Several accused have been arrested in connection with the alleged leak, including individuals suspected of sourcing the paper, transmitting it to coaching centres or candidates, and facilitating unfair advantages. The fast-track court in Delhi was designated to ensure speedy trial and reduce the backlog that often plagues high-profile cases.
The use of scientific tests like polygraphs and brain mapping in criminal cases has a mixed history in India. While investigating agencies have occasionally used them as part of broader probes, courts have consistently held that such tests cannot be the sole basis for conviction or exoneration. The Selvi judgement remains the key precedent, emphasising consent, judicial oversight and the limited evidentiary value of these methods.
Timeline
Early 2026: NEET paper leak comes to light; student protests and demands for CBI probe.
Mid-2026: CBI registers a case and makes multiple arrests, including Mangal Lal Biwal, Dinesh Biwal, and Vikas Biwal.
2026–2026: The Fast-track court in Delhi begins the day-to-day hearing of the NEET case.
Tuesday, August 4, 2026: Court seeks CBI response on plea by three accused seeking voluntary lie detector and brain mapping tests.
Coming weeks: CBI is expected to file a response; the court is to decide on maintainability and the possible conduct of tests.
Also Read: No More Protests at Jantar Mantar? Supreme Court to Hear Plea Against Suitability of Delhi Site
Why This Matters
This matters because it goes to the heart of how scientific evidence is treated in India’s criminal justice system. If the court allows the tests, it could set a precedent for other accused in high-profile cases to seek similar permissions, potentially reshaping defence strategies.
It also matters for public perception. The NEET case has already eroded trust among students and parents. Any move that appears to offer greater transparency—such as voluntary scientific tests—could be seen as a step toward fairness, even if the legal impact is limited.
For the accused, the tests are a way to assert innocence and cooperate with the probe. For the CBI and the court, the challenge is to ensure that such tests do not undermine the primacy of traditional evidence or create unrealistic expectations about their reliability. In simple Hinglish, jab log scientific test ki baat karte hain, toh unhe lagta hai ki sab clear ho jaayega, par court ka rule alag hota hai.
India angle
For Indian readers, this story is directly relevant because NEET is a national exam that affects lakhs of aspirants every year. Any compromise in its integrity strikes at the heart of educational fairness and meritocracy.
The India angle also includes the legal dimension. The Selvi judgement is a landmark in Indian criminal law, and any new development around polygraph and brain mapping tests is closely watched by lawyers, judges and rights activists. If the Delhi court’s handling of this plea leads to a higher court ruling, it could refine the legal standards for such tests.
There is also the investigative angle. The CBI’s response will be scrutinised to see whether it is open to using scientific aids as part of a broader probe or whether it prefers to rely on conventional evidence. This stance can influence how future high-profile investigations are conducted.
Analysis
My opinion is that the court is likely to allow the tests only under strict conditions—if at all—given the Selvi framework. Even if conducted, the results will not be decisive but may be used to corroborate or contradict other evidence.
I also think the accused’s strategy is partly about public perception. By seeking voluntary tests, they are signalling cooperation and transparency, which can help counter the narrative that they are obstructing the probe. Whether that translates into legal benefit remains to be seen.
What Next
The immediate next step will be the CBI’s response to the court on the maintainability of the plea. The agency may support the tests with safeguards, oppose them on legal grounds, or suggest alternative investigative methods.
If the court permits the tests, they will be conducted at an authorised forensic facility under judicial supervision, with clear protocols on questions, consent and recording. The results will then be submitted to the court and shared with both prosecution and defence for arguments on evidentiary value.
Longer term, the outcome could influence how scientific tests are used in other high-profile cases, especially where accused persons seek to assert innocence through such methods. It may also prompt debates on whether India’s legal framework needs updating to address new forensic technologies.
Conclusion
The Delhi fast-track court’s decision to seek the CBI’s response on a plea by three NEET accused for voluntary lie detector and brain mapping tests marks a notable moment in the ongoing paper leak case. While the accused argue that the tests will demonstrate their bona fides and assist in a fair investigation, the legal and evidentiary limits of such methods remain a key constraint.
As the case progresses, the court’s handling of this plea will be watched not only by those directly involved but also by legal experts, students and the public at large. The outcome could shape how scientific evidence is perceived and used in India’s criminal justice system, even as the broader NEET case continues to unfold.
Written By A. Jack
