I think it might have something to do with "terms of reference"
ie: what can be looked, what can't be looked ect, and good example of this terms of reference thingy, a certain business identity, associated with a certain sporting orginisation located in a certain australian capitol city couldn't be prosecuted due the charges that were investigated on were actually outside the terms of refernce of the enquiry the AFP conducted at the time.
However, to answer your question, in coroners court setting or any court setting, any evidence that is presented has to stand up to scrutiny, as insignificant as it may sound to you and I, it becomes pretty dam significant for a defendant and or the complainant.
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