London 2012 Olympics: Games legend Michael Johnson believes Oscar Pistorius has an 'unfair advantage'

The 400-metre world record holder, Michael Johnson, believes disabled athletes who use prosthetic limbs should not be allowed to compete in able-bodied races, as it has not been disproved whether or not it provides them with an "unfair advantage".

Can the guy get a blister on his big toe, pull a calf muscle, have shin problems? Johnson has a point.