S. 143(3) : Assessment-Search and seizure-Procedure laid down by Digital evidence Investigation Manual by Central Board of Direct taxes-Mandatory-Search warrant defective-Search violative of Rule 112-Digital data evidence collected by the Revenue from unknown locations without any valid search warrant and without following the guidelines issued by the CBDT vide Digital Evidence Investigation Manual-Not given an opportunity of cross examine the witness-Circulars issued by the CBDT is binding on all Income tax Authorities-Assessment order is quashed.[S.119, 143(3), R.112, Art. 226]