Used 40D vs New Rebel t3 Photography and Digital Camera

Hi everybody,
I've read the website and forums, but it's probably appropriate that my first post is asking advice on which camera to buy. My choices as I see them are my father in laws 40d, or a new rebel t3. I will be using the camera for work, forensic related. An example of the pictures I'll be take are of a car, showing indentations, scrapes, etc.
I will almost always be outside, in normal daytime conditions.
For cost, a new rebel is $500 with an 18 to 55, and the used 40d is $1000 new I think, and I'm not sure how much it's worth used.
Thanks in advance for any advice!
Used 40D vs New Rebel t3

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