IME

While retaining experts is commonplace in civil litigation, counsel are not always aware of who the expert has worked with, behind the scenes, to compile research or prepare analyses that contribute to the written report. We are also not always aware when the report itself was written not by the signatory, but someone else who worked on the file.

https://www.thelawyersdaily.ca/personalinjury/articles/6011/the-courts-weigh-in-on-ghost-written-expert-reports