The use of a radio helmet on defense is relatively new in the N.F.L., and some Giants players are still not convinced the new technology can be relied on.
Source: http://feeds.nytimes.com/click.phdo?i=4e94cf3ca453698503c0b552ec9577d8
Charles Woodson Haloti Ngata Nnamdi Asomugha Clay Matthews Michael Vick James Harrison Antonio Gates Patrick Willis