cannot help in giving embroidery to a story, however, true in the main. Therefore, it has to be appraised in each case as to what extent the evidence is worthy of acceptance, and merely because in some respects the Court considers the same to be insufficient for placing reliance on the testimony of a witness, it does not necessarily follow as a matter of law that it must be disregarded in all respect as well. The evidence has to be shifted with care. The aforesaid dictum is not a sound rule for the reason that one hardly comes across a witness whose evidence does not contain a grain of untruth or at any rate exaggeration, embroideries or embellishment. ( See Sohrab s/o. Beli Nayata and Another v. The State of M.P. 1972 (3) SCC 751 and Ugar Ahir & Ors. v. State of Bihar, AIR 1965 SC 277 ). An attempt has to be made to, as noted above, in terms of felicitous metaphor, separate grain from the chaff, truth from falsehood. Where it is not feasible to separate truth from falsehood, because grain and chaff are inextricably mixed up, and in the process of separation an absolutely new case has to be reconstructed by divorcing essential details presented by the prosecution completely from the context and the background against which they are made, the only available curse to be made is to discard the evidence in toto. ( See Zwinglee Ariel v. State of M.P., AIR 1954 SC 15 and Balaka Singh & Ors. v. State of Punjab, 1975 (4) SCC 511. As