The phrase "further proof" means additional evidence or support that helps to confirm, verify or prove something already known or believed. It is used when there is a need for more information or facts to strengthen an argument, claim or belief.
Finally there is the strict liability theory where upon showing a dangerous result, the manufacturer is held accountable without the necessity of showing further proof of wrongdoing. (rescuelaw.com)
The film stands as further proof of his status as an impeccable talent. (slashfilm.com)
If you need further proof of our capabilities, feel free to browse through our samples. (grandresume.com)