Proving Liability In a catastrophic car accident in New York, how do we prove liability? Liability means the other driver is responsible for your accident. To prove liability, your lawyer will have to show the jury a number of things. First, your lawyer will have to establish that you are more likely right than wrong, and what you are saying is true. The legal term for this is preponderance of evidence. However, the main thing to show to the jury is that you are more likely right than wrong, and that is done by using various tactics and presenting different types of evidence. For instance,