Section 128(1) of the uniform Evidence Acts applies where a witness objects to giving particular evidence that "may tend to prove" that the witness has committed an offence under Australian or foreign law or is liable to a civil penalty. It contains a version of the common law privilege against self-incrimination which entitles a person to refuse to answer a question or produce a document if the answer or production would tend to incriminate that person. If the court determines that there are reasonable grounds for the objection, the Court is obliged to give the witness a certificate which prevents the evidence from being used against the witness in any proceedings in an Australian court. A certificate is, for example, sometimes sought to protect a client from charges of tax fraud.