Polygraph test can be conducted only after obtaining consent of accused; mere silence will not amount to consent: Karnataka High Court
Such consent by the accused has to be categorical, without any doubt and should be made after being informed and made aware of the implications of the test.
Polygraph test cannot be administered without obtaining the written consent of the accused person to whom it is to be administered, the Karnataka High Court ruled (Virendra Khanna v. State of Karnataka).