Blanket regulation could even fail the environment, he added, pointing to laws designed to protect sandalwood forests in the Philippines.

BBC: Business presence fuels summit tempers

"And if the people administering the system during the match are not up to it, don't blame the system, " he added, pointing to a contentious decision made by third umpire Daryl Harper to give Brendan Nash out lbw during the West Indies first innings in the fourth Test against England in Barbados.

BBC: Fletcher backs referral system

But he added the study also highlighted the need for early diagnosis, pointing out an estimated a third of people with HIV do not know they have it.

BBC: HIV drugs 'add 13 years of life'

"It is fair to say that every time Andrew Sheridan is supposed to beat someone up, as a pack we don't, " added the former Lions prop, who insisted he was not pointing the finger at the Sale giant.

BBC: Injured Kearney out of Kings game