Question: Which of the US competitors with initial R on the list of doping cases is younger ?

text: List of doping cases in athletics
R

The use of performance-enhancing drugs (doping) is prohibited within the sport of athletics. Athletes who are found to have used such banned substances, whether through a positive drugs test, the biological passport system, an investigation or public admission, may receive a competition ban for a length of time which reflects the severity of the infraction. Athletes who are found to have banned substances in their possession, or who tamper with or refuse to submit to drug testing can also receive bans from the sport. Competitive bans may also be given to athletes who test positive for prohibited recreational drugs or stimulants with little performance-enhancing effect for competitors in athletics. The sports body responsible for determining which substances are banned in athletics is the World Anti-Doping Agency (WADA). Typically, any athlete who tests positive for banned substances after having served a previous ban receives a lifetime ban from the sport of athletics. Many high-profile sportspeople to receive doping bans have come from the sport of athletics, with significant past cases concerning Ben Johnson, Lance Armstrong, Alberto Contador, Shane Warne, Diego Maradona, Shoaib Akhtar, Marion Jones and Tim Montgomery. Furthermore, a number of athletes who underwent state-sponsored doping programmes in East Germany between the 1960s and 1980s were competitors in athletics, but the quality of the international anti-doping work was so poor that only one East German athlete ever tested positive. Following allegations of state-sponsored doping in Russia, the IAAF suspended the country's athletes from competition, including the 2016 Summer Olympics.
Name Country Event Date of violation Banned substance ( s ) / Anti-doping rule violation Sanction
Nikolay Raev Bulgaria Triple jump 1993 Amphetamine
Ebrahim Rahimian Iran Race walk 2013 Testosterone , EPO 2 years
Paweł Rakoczy Poland Javelin throw 2008 Sibutramine Public warning
Sara Ramadhani Tanzania Cross country running 2014 Isometheptene 2 years
Rashid Ramzi Bahrain Middle distance 2008 { Re-analysed in 2009 ) CERA 2 years
Allison Randall Jamaica Discus throw 2013 Hydrochlorothiazide 2 years
Kevin Rans Belgium Pole vault 2009 Corticosteroids 3 months
Meliz Redif Turkey Sprinting 2012 Biological passport 3 years
Dimitrios Regas Greece Sprinting 2008 Methyltrienolone 2 years
Julio Rey Spain Long distance 1999 Mesterolone 2 years
Butch Reynolds United States Sprinting 1990 Anabolic steroids 2 years
Antoine Richard France Sprinting 1987  2 years
Mark Richardson Great Britain Sprinting 1999 Nandrolone 18 months ( reduced from 2 years )
Elisa Rigaudo Italy Race walking 2002 Caffeine Public warning
Hristina Risteska Macedonia Sprinting 2015 Stanozolol , methandienone , norandrosterone 4 years
José Rocha Portugal Long distance 2010 Biological passport anomalies 2 years
Mike Rodgers United States Sprinting 2011 Methylhexaneamine 9 months
Rosa America Rodríguez Venezuela Long distance 2010 Nandrolone 2 years
Zudikey Rodríguez Mexico Sprinting 2010 Methylhexanamine 6 months
Marielis Rojas Venezuela High jump 2011 Norandrosterone 2 years