I agree with what everyone else has said.

That being said I would like to share with you my own personal experience. I always strived to please my parents. I never got the approval I wanted. When it was time for me to go to college they wanted me to go to a certain school and study biology to become a Physical Therapist. I wanted to go to different college and wanted to study something related to children and helping them. I was so obsessed with pleasing them that I did go to the college they wanted (for 2 years) and for 3 1/2 years I did study biology & chemistry (luckily I had some interest in it). I transfered to the school I wanted to b/t my sophmore and junior year. I liked it so much better. It took me until almost the end of my junior year to finally stand up for myself and go into the career I wanted. It was very hard to do, but I wish I had done it sooner. I did get the degree I wanted. But I never did get their full approval. In fact I have never gotten their full approval on anything. (My parents did not pay ONE penny in my education)

My advice to you is to go into the field you want to go into. Do some research, make sure it's what you want. See if you can do some sort of job shadowing. Bring this all to your mom. Let her know that you really want to go into crimonlogy, also let her know that her approval means alot to you. But in the end it's your decision. Please do what is going to make you happy and not someone else.

Sorry for the long post. Hope that it helps some.