Both at home and further afield, it’s been a busy few day in the world of anti-doping.

Larry Ryan brings you the daft controversies, wacky conspiracy theories, memorable quotes and some of the craziest lines from the sporting year.

The controversy surrounding Jamaica’s anti-doping programme has intensified after the country’s most senior drug tester claimed recent positive tests could be the “tip of the iceberg”.

Drug testing has been a big part of my life as an athlete. The Irish Sports Council takes a strong stance on testing and I have been consistently drug tested for the past 12 years.

Trinidad and Tobago’s Kelly-Ann Baptiste withdrew from the World Championships due to a “doping matter”, her national athletics federation has confirmed.

Usain Bolt racked up his sixth world title in Moscow to go alongside his half dozen Olympic golds – and then declared he was far from done with winning.

Athletics’ world governing body will hand four-year bans to those caught doping from 2015 — a move president Lamine Diack hopes will help in the never-ending fight with drug cheats.

Athletics’ world governing body, the IAAF, will hand four-year bans to those caught doping from 2015.

Usain Bolt had just completed his press conference after winning 200 metres gold at the London Olympics, his second title of the Games, and had risen from his seat when he paused for a moment before deciding he had one last message to impart.

Usain Bolt returns to the Olympic Stadium tonight looking to revive memories of London 2012 and at the same time lift the gloom hanging over athletics.

Irish Olympic swimmer Barry Murphy says dopers who return after a ban should be made wear different coloured bibs or hats.

Asafa Powell’s trainer has insisted he is not to blame for the Jamaican sprinter’s positive drugs test and claims he is being made a scapegoat.

Irish sprinter Jason Smyth, who trains alongside shamed American Tyson Gay, says drug cheats should be banned from athletics.

Prosecutors in Italy have launched a criminal investigation into Jamaican sprinters Asafa Powell and Sherone Simpson and their Canadian trainer Christopher Xuereb.

Irish athletes face more stringent anti-doping tests than many of their international rivals, claims the Irish Sports Council’s anti-doping programme director Dr Una May.

Athletics was today facing one of its darkest periods in recent history thanks to a devastating drug scandal.

US sprinter Tyson Gay and Jamaican former 100m world record holder Asafa Powell have failed drug tests.

Jamaican sprinter Asafa Powell has failed a drugs test, his management company has confirmed.

Usain Bolt coasted to 100m victory at the Jamaican trials in 9.94 seconds but Asafa Powell could not book his place at the World Championships as he finished seventh.

Judging by his Twitter activity, boxing medal hopeful Paddy Barnes is determined to make a few famous friends in London.

Jamaica’s Usain Bolt admitted he was delighted to prove his doubters wrong after retaining his Olympic 100m title in London.

Usain Bolt last night fulfilled his dream of becoming a “legend” of the sport by successfully defending his Olympic 100m title in stunning style in London.

The queues began long before the main event.

Usain Bolt tonight fulfilled his dream of becoming a “legend” of the sport by successfully defending his Olympic 100m title in stunning style in London.

A proud Usain Bolt will carry the Jamaican flag at tonight’s opening ceremony for the London 2012 Olympics adamant he is fit for the real business of retaining his titles.

Former Ireland international long jumper Ciarán McDonagh will fly to Birmingham this morning to assist the Jamaican Olympic sprinters’ preparations for the London Games.

Olympic 100m champion Usain Bolt has escaped unharmed from a minor road accident in Jamaica, according to reports.

Dwain Chambers admitted emotions had to be “put to one side” as he prepared to compete in his first relay for Great Britain for six years.

Usain Bolt ran a season’s best 9.85 seconds to win the World Challenge meeting in Zagreb tonight in his first 100 metres since false starting at the World Championships.

Usain Bolt today issued an ominous warning to the challengers for his World Championship title with a commanding victory in the heats of the 100 metres in Daegu.

Jamaica’s Asafa Powell has been ruled out of the individual 100 metres at the World Championships in Daegu with a groin injury, but hopes to run in the relay, his agent Paul Doyle has said.

USAIN BOLT has brought his 2010 season to an early close to avoid risking a serious injury which could hamper the defence of his world titles in Daegu next year.

Tyson Gay proved Usain Bolt is not invincible over 100metres by winning tonight's DN Galan meeting in 9.84seconds at the Olympic Stadium in Stockholm.

OLYMPIC and world champion Usain Bolt recovered from a poor start to win the 100m at the Paris Diamond League meet in 9.84 seconds last night.

TYSON GAY returns to action after a six-week injury lay-off at the IAAF Diamond League meeting in Eugene in Oregon today determined to prove he can challenge the sprint dominance of Usain Bolt.

Usain Bolt will only step up to the 400metres if it is what he needs to become an athletics legend – but is in no danger of losing his hunger for shorter sprints.

Usain Bolt completed his hat-trick of sprint titles at the World Championships tonight..

Usain Bolt smashed his own 100 metres world record by winning in 9.58 seconds to claim gold at the World Championships in Berlin.

USAIN BOLT last night broke his own world record with another sensational performance to win the 100m at the World Championships in Berlin.

Usain Bolt tonight broke his own world record with another sensational performance to win the 100 metres at the World Championships in Berlin.

Usain Bolt will head to Berlin for the World Championships as a double world record holder and triple Olympic gold medal winner – but not as defending champion.

Tyson Gay sent another warning to Usain Bolt that he has the credentials to defend his 100 metres world title with another stunning performance tonight.

TRIPLE Olympic champion Usain Bolt last night admitted he was saddened by the news that five fellow Jamaican athletes had tested positive for a banned substance.

The International Association of Athletics Federations (IAAF) tonight confirmed that five Jamaican athletes have tested positive for a banned substance.