Don't put your faith in CARFAX!
I question the validity of Carfax. Before I bought my Durango which was supposedly involved in a "minor" accident from what the used car dealer said, I figured I better subscribe to a month's worth of Carfax. The Durango came up clean and didn't show much else except the date it was first registered. I later discovered the "fender bender" was a little more than that. After I got the new vehicle home, I crawled underneath and found a completely new front drive train and suspension, still had dealer paper work and stickers on parts.
Since I had unlimited use of Carfax, I thought I'd run my Intrepid and '91 Power Ram just for kicks. I had purchased both of these vehicles used and I know the Intrepid had undergone some moderate body work from a previous owner from the obvious overspray that was visible inside the engine compartment and underneath the front bumper. As a matter of fact, after I purchased the vehicle I discovered that at some point in the cars past, water had been sitting in the spare tire compartment, enough to fully rust the spare tire and jack! Luckily, no rust damage was found inside the trunk. I can't imagine how that much water had gotten in there, but I speculate it was sitting in a yard with the trunk open for some length of time.
Oddly, Carfax did not pick up on anything. The Intrepid had a clean bill of health as well as my Ram. Now I know my Ram was clean except for one small thing that Carfax should have discovered. The odometer had not been functional for 2 years. Now I'm not sure how Carfax gathers it's data since mileage isn't reported every year when a vehicle is registered, but I believe mileage is recorded when inspected (not sure).
Needless to say, I don't put much faith in Carfax. I even emailed them asking for a refund due to the lack of data provided on all 3 vehicles. Even though they claim money back gaurantee, I didn't really expect to see one. Well, I never even heard back from the SOB's. Luckily, all 3 vehicles have been excellent rides and I have no regrets of thier purchase.