While Chinese shooter Yi Siling emerged as the first gold medal winner in the London 2012 Olympic Games, Albanian weightlifter Hysen Pulaku becomes the first athlete to fail the doping test and to be ejected from the mega-sporting event.
Siling, 23, recorded her victory in the women's 10m Air Rifle by beating Poland's Sylwia Bogacka.
Siling after receiving her medal from International Olympic Committee (IOC) Chairman Jacques Rogge, said, "I'm very happy. I want to say thanks to China, to my mother and father."
"I'm very excited and happy. I have been shooting since I was 13-years-old," said Siling after winning the first gold medal of the London Olympics 2012.
Meanwhile, another Chinese contender, Yu Dan, collected the bronze medal while Beijing 2008 gold medallist Katrina Emmons finishing fourth.
Hysen Pulaku Fails doping test:
The 19-year-old, weightlifter, who was about to compete in the men's 77kg category, was banned from taking part in the Olympics even before the start of biggest sporting event for doping violations.
Pulaku is facing the possibility of two years ban by the international weightlifting federation.
Pulaku tested positive on July 23 for Stanozolol - an old, relatively cheap and easy-to-detect drug, which like other anabolic steroids, is designed to mimic the effects of the male sex hormones testosterone and dihydrotestosterone.
Higher levels of testosterone cause anabolic changes in the body, including an increased rate of protein synthesis. This in turn can boost muscle growth and an ability to recover more quickly between bouts of strenuous exercise.
The drug was detected in Pulaku's urine sample. His personal coach and uncle, Sami Pulaku, said neither he nor Pulaku denied the presence of the steroid and that the decision would not be contested.
"Of course it is always a sad day when a cheating athlete is caught," said IOC spokesman Mark Adams. "I hope there will not be more."
It was the same steroid that saw Greece's world indoor high jump champion Dimitris Chondrokoukis withdraw from the Games on Thursday after a positive test for the drug which Canadian sprinter Ben Johnson used before the 1988 Seoul Games.
Johnson was sent home in disgrace after metabolites of the anabolic steroid were found in his urine sample following his victory over Carl Lewis in the 100 meters final in world record time.
(With inputs from Reuters)