According to article 206 of the Criminal Procedure Code, any evidence obtained illegally is invalid. Again, in accordance with Article 22 of the Constitution, the confidentiality of communication is essential. Article 20 of the Constitution states that private life cannot be touched. However, if there is a certainty that the evidence will be lost in the attack directed against the person and that it will not be possible to prove it again, the evidence he will receive will be binding. In the event in question, even if the person obtained the evidence of the threat against him illegally while he was arguing with the attacker, it would be of evidentiary value to take a sound recording of the sudden event, since there is no opportunity to apply to the competent authorities at that time and the evidence will be lost. You can review the sample Supreme Court Decision.