1. Case law may act as a example, but should not be used as a guarantee of result - each case is judged separately and often by different courts with different focus and understanding of the material, and although prior case law is a influence, it’s not a guarantee of result.
2. By looking at cases between similar nations (e.g. english speaking, 1st world nations with similar government structures) you might be able to derive information about how another nation’s courts might interpret a new situation.
3. Information gathered from questionable sources might be admitted in court - such as information gathered through activities that may themselves be illegal, such information gathered by a vigilante.
4. Scienter and Self-Help are important concepts in our legal system - acting with scienter is to act knowing that you are committing a wrongdoing. Wikipedia
has a bit on this topic. Self-Help is acting on your own behalf without engaging law enforcement, Wikipedia
also has a blurb on this concept.
5. Computer forensics work often requires licenses so it is important to understand the requirements in your state if you are to perform forensics work as a professional.
6. Being aware of international and state law boundaries/compliance is important when gathering evidence and attempting to pursue a situation, especially on the Internet since it crosses so many legal jurisdictions and there might be multiple overlapping law enforcement agencies.