A little confused about Digital Forensics and the tools to use

So I took Digital Forensics 1 at Eastern. The professor that taught the class owns his own forensics business. One of the things the professor kept repeating through out the semester: “You can’t use Open Source Tools for Forensics, it won’t stand up in court”. “You have to use Court approved tools, tools that the court has accepted in previous trials”.

Tonight, we started Digital Forensics 2. It’s a different professor. This one does Digital Forensics for a living as well for the Department of Justice. He said that you can use Open Source tools for Forensics, does so regularly, and testifies in court for it. This professor said there are no such thing as court approved tools, even though that Encase claims otherwise in their marketing material.

So I’m confused. Can you or can you not use Open Source tools Digital Forensics? I know there are books on the subject like Digital Forensics with Open Source Tools by Cory Altheid, but don’t know how it’s viewed over all when using Open Source tools.

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