The burden of proof is based on policy, which once again I'm going to say is sort of governed by Treasury Board policy. The LTD policy itself is quite clear that you have to demonstrate that, number one, your current condition was related to military service, or that it was not related to military service but you are totally disabled, and both of those conditions satisfy the requirement and the policy that you cannot work. As long as you cannot work and you can demonstrate that through either physical, psychological, or other evaluations, then you are eligible for the benefit.
On April 2nd, 2015. See this statement in context.