while others contained traces of a brown residue, alcohol wipes, cotton buds and cards advertising a needle exchange in central London. According to a police drug expert, PC Adrian Parsons, the heroin found was of importation quality -- that is, with a purity of 61 %, compared with the average 26 % purity found at street level. The 6.91 grams -LRB- about a quarter-ounce -RRB- recovered would have been worth  # 350 to  # 550 -LRB- about $600 to $940 -RRB-, Fotheringham said. Burnt spoon, knotted tights Geldof was discovered sitting slumped on a bed in the spare bedroom by her husband, rock musician Tom Cohen, who went to their home after he became concerned when he could n't contact her. The couple's younger son, Phaedra, was in the house at the time, having been dropped off by Cohen's father the previous afternoon. The musician had taken both children to spend the weekend at his parentshome. A pair of knotted black tights was found under her body, and a burnt spoon containing a small amount of a brown residue in the bowl was found under the bed, Fotheringham said. The tights could have been used as a tourniquet while she was injecting the drug. An autopsy also found evidence of recent puncture marks on the inside of both elbows and on her left hand. The inquest heard that tests by a forensic scientist suggested recent use of the drug, resulting in a high concentration of