 Track and field athletes are banned from ingesting or using certain substances by governing bodies for the sport , from the national to the international level . The IAAF 's constitution incorporates the World Anti @-@ Doping Code among other anti @-@ doping measures . Practices such as blood doping and the use of anabolic steroids , peptide hormones , stimulants , or diuretics can give athletes a physical competitive advantage in track and field . The use of such substances in track and field is opposed on both ethical and medical grounds . Given that the sport functions by measuring and comparing athletes ' performances , performance @-@ enhancing substances create an uneven playing field — athletes who do not use doping substances have a disadvantage over rivals who do . Medically , the use of banned substances may have an adverse effect upon athletes ' health . However , some exemptions are made for athletes who take banned substances for therapeutic use , and athletes are not sanctioned for usage in these cases , such as Kim Collins ' failed drug test due to asthma medication . 
 Track and field athletes are banned from ingesting or using certain substances by governing bodies for the sport , from the national to the international level . The IAAF <a href='null_genetive' title='1'><mark>'s</mark></a>constitution <a href='uninflect' title='2'><mark>incorporates</mark></a> the World Anti @-@ Doping Code among other anti @-@ doping measures . Practices such as blood doping and the use of anabolic steroids , peptide hormones , stimulants , or diuretics can give athletes a physical competitive advantage in track and field . The use of such substances in track and field is opposed on both ethical and medical grounds . Given that the sport functions by measuring and comparing athletes <a href='null_genetive' title='3'><mark>'</mark></a>performances , performance @-@ enhancing substances create an uneven playing field — athletes <a href='null_relcl' title='4'><mark>who</mark></a>do not use doping substances <a href='got' title='5'><mark>have</mark></a> a disadvantage over rivals <a href='null_relcl' title='6'><mark>who</mark></a>do . Medically , the use of banned substances may have an adverse effect upon athletes <a href='null_genetive' title='7'><mark>'</mark></a>health . However , some exemptions are made for athletes <a href='null_relcl' title='8'><mark>who</mark></a>take banned substances for therapeutic use , and athletes are not sanctioned for <a href='negative_concord' title='9'><mark>usage</mark></a> in <a href='None' title='10'><mark>these</mark></a><a href='negative_concord' title='11'><mark>cases</mark></a> , such as Kim Collins <a href='null_genetive' title='12'><mark>'</mark></a>failed drug test due to asthma medication . 
Track and field athletes are banned from ingesting or usin certain substances by governing bodies for the sport , from da national to tdainternational level . The IAAF  constitution incorporate thdaorld Anti @-@ Doping Code among other anti @-@ doping measures . Practices such as blood doping and the use of anabolic steroids , peptide hormones , stimulants , or diuretics can give athletes a physical competitive advantage in track and field . Thedae of such substances in track and field is opposed on both ethical and medical grounds . Given that the sport functions by measuring and comparing athletes  performances , performance @-@ enhancing substances create an uneven playin field — athletes do not use doping substances got a disadvantage ova rivals do . Medically , the use of banned substances may have an adverse effect upon athletes  health . However , some exemptions are made for athletes take banned substances for therapeutic use , and athletes ain't sanctioned fir no usage in no cases , such as Kim Collins  failed drug test due to asthma medication .