I'm going to be going into Forensic Science too.
I'll be going for the toxicology side of it. Basicly doing testing for drugs and poisons. Anything on the chemistry side of it.
My Uni offers this as a certificate which is about the same as a minior. My major is chemistry, so the two are closely related.
Since its a certificate, I need to go through all the classes required to receive it. That includes criminal justice classes and many other classes that are somewhat related but won't be used to often.
I'm only a second year student and have only worked on the classes for my major. I doubt I will be able to get it all done in four years so will probly be taking an extra year or two. And with the extra time, I might also be able to get two or three more classes done and get double certificates.
My thoughts on forensic science: I think its a good field to go into, but if you got the idea from CSI or some show like that then it probly isn't the job for you. Its long boring and dull. You really need to just have a joy of doing labwork if your going into the lab side of it. Even if you don't use the degree, it still looks damn good on a resume.
Goodluck to you.