Is there a law that says if you have medical condition and car accident wont be held liable?

No, there is no such law. If you have a medical condition that contributes to a car accident, you may still be held liable for the accident. However, the extent of your liability may be reduced depending on the circumstances of the accident. For example, if you have a medical condition that causes you to lose consciousness and you crash into another car, you may not be held liable for the accident if you can prove that you could not have prevented it. However, if you have a medical condition that does not cause you to lose consciousness and you still crash into another car, you may be held liable for the accident even if you did not intend to cause it.