World Athletics governing body says improvements in testing would make it harder than ever for athletes to avoid being caught.
Mutaz Essa Barshim was unbeaten in 11 competitions in 2017 and Nafissatou Thiam broke through the 7,000 points barrier by registering 7,013 at a meeting in Austria.
Jamaican athlete, Usain bolt made history on Friday night as he won his third gold medal of the Rio Olympics and the ninth gold medal of his Olympic career.
53 of the 67 Russian track and field athletes banned by the IAAF took part in the 'Games' in Moscow.
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