The missing phrases in the sentence stated above about the definition of insanity and it's interpretation during a verdict are actual juries and preexisting common sense.
Juries refers to those charged with the hearing of court cases and are expected to render judgement based on the the conclusion of the hearing.
The definitions which are attributed to insanity differs from person to person especially in the legal framework. Hence, the interpretation given to insanity will depend on the volition of the juries.
These interpretation are usually derived from past and preexisting encounters and experience which they have acquired during their legal practice.
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