It comes down to the benefit of the doubt. If you have two equal medical opinions, the way the law is written, the benefit of the doubt goes to the one that's most favourable to the veteran. Oftentimes that's not the case, so people will push for the one that isn't favourable. If we're not clear on the medical information, then we seek an independent medical opinion.
On October 22nd, 2012. See this statement in context.