After some brief confusion about Jarryd Hayne's status for this summer's Olympic Games, World Rugby has issued clarification. They have declared Hayne eligible to participate. You can read the full statement below in italics.
A former Australian anti-doping official had said Hayne needed to be in a testing program for at least six months, and thus should not be eligible. Subsequent commentary suggested the six month requirement was for players who were highly questionable previously. Although the NFL does not follow WADA regulations, it would seem there is not enough cause for concern to require extra testing.