The Canada Revenue Agency officials have had a number of meetings and some discussions with the Canadian Psychological Association, and they've tried to explain to them specific applications of the GST. With respect to the services you've just mentioned, where a report, examination, or other service is performed solely for the purpose of determining liability in a court proceeding or under an insurance policy, it will be considered taxable. However, where an assessment is done along with outlining a treatment plan or some other sort of health care-related services that are being provided, that will be considered to be an exempt service, because it's done in the context of designing a health care treatment plan for an individual.
On May 28th, 2013. See this statement in context.