Fast bowler Mohammad Asif failed again to clear his dope test and his 'B' sample has tested positive for the banned steroid nandrolone. However, this is strange to note in this case that the quantity of nandrolone was 6.2 in the previous test but this time it is 5.4. Mohammad Asif said that he would challenge on this basis that how the quantity of nandrolone varied as the tests were taken at the same time. The 25-year-old fast bowler tested positive during the Indian Premier League competition held between April and June, and the Pakistan Cricket Board suspended him in July on the basis of his first sample.