http://www.bbc.co.uk/sport/0/rugby-union/30671380
If this is found to help detection and improve the safety of players then could it work in the NHL?
Saracens players wore impact sensors behind their ears in Saturday's win against London Irish as they launched a new concussion research programme.
The device, called the xPatch and produced by a US company, measures the size and angle of hits to the head.
"We don't want to meet our players in 20 years' time to find them suffering from dementia and reflect we suspected something was going on but didn't really know," said Edward Griffiths.
"We want to know - we want answers."
The Saracens chief executive added: "We feel obliged to ask these questions, however uncomfortable they may be."
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If this is found to help detection and improve the safety of players then could it work in the NHL?
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