Based on the provided legal document, here are the key points with corresponding references:

• Case Details: The case is Sumit Tomar vs. State of Punjab, decided by the Supreme Court of India on 19-10-2012, involving Criminal Appeal Nos. 1690-1691 of 2012 arising from S.L.P. (Crl.) Nos. 9415-9416 of 2011. (!)
• Legal Act and Sections: The judgment pertains to the Narcotic Drugs and Psychotropic Substances Act, 1985, specifically referencing Sections 8, 15(a), 15(b), 15(c), 60, and 61. [judgement_act_referred]
• Independent Witness Requirement: It is desirable for the prosecution to examine at least one independent witness; however, if official witness evidence is reliable and there is no animosity between the accused and these witnesses, conviction can be sustained even without an independent witness. (!) (!) (!) (!) [1000520800007][1000520800008]
• Mixing of Contraband: Mixing the contents of two bags containing poppy husk powder before drawing samples does not cause prejudice to the accused, provided the total quantity remains above the commercial quantity threshold. (!) (!) [1000520800009]
• Facts of the Case: The appellant was caught driving a car containing two plastic bags of 'bhooki' opium powder (poppy straw) at Basantpur Bus Stand, Patiala; the total seized quantity was 69.50 kgs (commercial quantity), and the driver's companion died during the investigation. [1000520800002][1000520800012]
• Conviction and Sentence: The appellant was convicted under Section 15 of the NDPS Act and sentenced to 10 years of rigorous imprisonment along with a fine of Rs. One lakh, as the quantity involved exceeded the commercial limit. [1000520800012][1000520800007][1000520800009][1000520800010]
• Outcome: The Supreme Court found no infirmity in the conviction and sentence, dismissed the appeals, and held that the procedure adopted by the prosecution was not improper. (!) [1000520800008][1000520800009][1000520800011]