K. K. Nambiar v. Union of India and another, AIR 1970 SC 652, held as follows:

"The appellant filed an affidavit in support of the petition. Neither the petition nor the affidavit was verified. The affidavits which were filed in answer to the appellant's petition were also not verified. The reasons for verification of affidavits are to enable the Court to find out which facts can be said to be proved on the affidavit evidence of rival parties. Allegations may be true to knowledge or allegations may be true to information received from persons or allegations may be based on records. The importance of verification is to test the genuineness and authenticity of allegations and also to make the deponent responsible for allegations. In essence verification is required to enable the Court to find out as to whether it will be safe to act on such affidavit evidence. In the present case, the affidavits of all the parties suffer from the mischief of lack of proper verification with the result that the affidavits should not be admissible in evidence."

Wise people with use this judgement of Hon. Apex Court, to demolish the DV case based on meagre affidavit.