Two of the sport’s biggest names Tyson Gay and Asafa Powell had failed drugs tests and tested positive for an Unidentified Substance at an out-of-competition test on 16 May 2013.
30 years old Gay is the second fastest man of all time and has run the three quickest 100m times of 2013, but tested positive for an unnamed substance.
The triple world champion will have his ‘B’ sample tested in last week of July 2013, but has already backed of the USA’s World Championships team and Diamond League meeting in Monaco.
Asafa Powell on the other hand has clocked 9.88s but was not selected in Jamaica World Championships team to travel to Moscow in August 2013.
Jamaican Asafa Powell’s name emerged as one of five Jamaican athletes – two in field events and three sprinters – who returned adverse findings following the tests conducted at their National Trials, staged in Kingston from June 20th-23rd.
About Banned Drug taken by Asafa Powell
The banned drug is named oxilofrine and is a stimulant used to boost the body's ability to burn fat. It helps athletes to boost their power-to-weight ratio with more lean muscle and less fat, and so increase their speed.
It may also increase the rate at which the heart reaches its maximum performance during exercise, meaning a greater supply of oxygen can get to the muscles earlier.
Oxilofrine is an agent that stimulates part of the nervous system and was previously used to treat low blood pressure. More recently, oxilofrine is found in combination with caffeine in dietary supplements marketed as weight loss products.