The best medico-legal reports always document the baseline assumptions upon which conclusions were reached with evidence…if the assumption is wrong (eg camera proof that I did not fall over on a grape in Coles and break my wrist but CCTV shoes it was when I got out of the car) an updated opinion can be provided.
Differs from the WCMO assumption (‘I assume’) of the customer facing moron who just wants to get rid of you rather than provide factual information