Passage Summary: A lawyer explains the specific rules for when it is okay to look at someone's computer files without asking: it must be a business computer, and it is especially okay if you think there is evidence of a crime on it.

Reasoning: Accessing computer files without permission is only justified if the computer is for business use; it is definitely justified if it is a business computer and there is reason to believe it contains legal evidence.

Analysis: This stimulus sets up a strict conditional requirement: business use is a necessary condition for justification. If a computer is used for personal hobbies or home life, the lawyer's principles would immediately tell us that unauthorized access is not justified. When applying these principles, look for a scenario that either meets both the business and evidence criteria to prove justification, or one that fails the business criterion to prove a lack of justification. It is a classic 'if and only if' structure that rewards careful attention to the necessary versus sufficient conditions.