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The answer to your question is most likely "yes." Police reports are inadmissible at trial and so is a police officer's testimoy as to who he "believes" is at fault. Liability assessments can only be made by qualified experts, such as accident reconstructionists.
However, liability against the driver behind you can only be established if you contend that he hit you first and was not simply "pushed into you" when he was hit by the third driver. If the latter scenario is how the accident occurred, the driver immediately behind you was not negligent because he was pushed into your vehicle against his will and due to the negligence
of the third car.
If, on the other hand, the driver imemdiately behind you rear-ended you without being pushed into your car, he would be the liable party. If that's the case, you can most likely still bring a claim, though you would stil bel subject to the original statute of limitations (2 years from the date of the accident for bodily injury) as you were on the other claim.
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