I once was called as a medical witness by the defense (lawsuit against police department). During cross-examination, the plaintiff asked again about my credentials and if I was board-certified. He then said he would like to introduce me as an expert witness, which the defense didn't object to and the judge allowed. He then asked me questions of expert opinion to which I replied to every single one of them "I'm sorry, you're asking a question that is not a medical fact that I can attest to. This is an expert witness question for which I am not prepared to answer." Finally after saying that for the fifth time, he took a hint, asked for a recess, then offered me $1000/hour to testify as an expert witness for which I refused. He refused to pay me $5000/hour to do this on the spot. Plaintiff lost the case.