A more thorough explanation:

Definition: Half-proof is a type of evidence that is not strong enough to support a decision or ruling. In civil law, it can refer to proof established by only one witness or a private document.

For example, if a person is accused of a crime and there is only one witness who saw the crime happen, this would be considered half-proof. The testimony of one witness alone may not be enough to convict the accused. Similarly, if a private document is presented as evidence in a civil case, it may only be considered half-proof if there is no other supporting evidence.

Half-proof is not enough to make a final decision or ruling. It is only considered as a starting point for further investigation or evidence gathering.