Even as the Supreme Court recently declared illegal brain mapping and polygraph tests on suspects, senior former IPS officer Kiran Bedi on Saturday said these were required to bring out truth from hardened criminals during investigation.
Order of the apex court is bound to cause strong hardship to the investigating agencies across the country, including CBI, she said while delivering a lecture on Gandhian model of policing organised by an NGO in Jaipur.
She said the CBI chief has also opposed the order of Supreme Court.
Bedi said accused like Mumbai terror attack convict Ajmal Kasab and fake stamp scam convict Abdul Karim Telgi know how to fail a lie detector test.
'Brain mapping test provides 100 per cent correct results and is a most effective tool today for investigating agencies,' she said.
While the courts view the rights of the victims and also accused but it must also consider problems of the investigating agencies, she added.
The first woman IPS officer said policemen should not 'bow' to external pressure in investigation of a crime.
She said the Gandhian model of policing does not means being idealistic rather it means police officials must do their job with integrity and honesty in accordance with law.