Remember that doing forensics might not be as hot as it looks on CSI
You can always do a few courses on it before you decide on majoring in BioChem etc.. From what I know, you need quite good fundamentals in Chemistry, and its not always an exciting subject as you can see from
Main Page - Chemistry.
You need chemistry because of you need to know why and how you are duplicating your DNA (PCR) or how dusting for fingerprints work!
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http://wikichem.net - WikiChem the Chemistry Wiki