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Drugs in sport are not a new thing.

They've been around for years, with reports that marathon runners were regularly given a mixture of on the way round to keep them going in the early part of the 20th Century.

But it wasn't until 1967 that the International Olympic Committee decided to introduce strict anti-doping regulations.

They proved an instant success as one year later, at the Mexico Games of 1968, the first athlete was caught.

Swedish modern pentathlete was the unlucky man who was sent home after testing positive for alcohol.

Not the most performance-enhancing of drugs you would think, but Liljenwall necked a to steady his nerves before the pistol-shooting discipline, and received the ultimate punishment.

The team also had to hand back the bronze medals they had won.

Fast-forward 40 years and the IOC are preparing to embark on the stictest of testing yet at the Beijing Games after a

Three of them (pictured above) were gold medallists and the first track and field athletes to test positive since a certain .

Hungarian duo, discus thrower Robert Fazekas (top left), and hammer thrower Adrian Annus (bottom left) both refused to give urine samples, while Russian shot putter Irina Korzhanenko tested positive for stanozolol, the same drug used by Johnson.

So, what are you expecting from this summer's Games? The IOC has just unveiled its and 4,500 tests will be carried out, almost 1,000 more than in Athens.

But why not just test every athlete to make sure none slip through the net?