ID:110005
 
In all honesty, the only majors I could think of would be criminology. I suppose some law school, but not enough to become a lawyer I imagine.

I don't really want to become a lawyer or detective, but I do want to significantly increase my deductive reasoning skills.

Do you have any tips? Articles, tests, etc., or ideas for classes I should take to increase this type of skill? I'm interested in the skill itself, not any sort of career. I am still much more highly motivated by a Computer Science degree. Anyways, ideas?
Lol, my English teacher went to law school for that exact reason. He didn't want to be a lawyer so he just didn't take the bar exam...
For the MCATs I have to answer a lot of deductive reasoning questions, along with other verbal reasoning questions. My tutor encouraged me to to pick up The Economist. Might help you out, if not it's still interesting.
You could take a logic class. I took one, it was pretty fun.

Also, this might be a good experience:
http://projecteuler.net/
Criminology doesn't require deductive skills, don't believe what you see in the movies. A good detective is a lucky, persistent detective, and if you try to Holmes your way out of a case you won't get very far.

That said, there is no way to increase deductive skills. You can improve in a particular area (math theorems, for example) by learning patterns of reasoning, but your raw skill remains the same.
Then, rephrased:

"I would like to train myself to think deductively and logically with better accuracy than I currently have."
Get brain pills or something. Hope they make your brain larger. Otherwise you'd have to stick to a specific field of deduction, such as maths.