Cook Illinois Jury Instruction — 5.2 Expert Witnesses When Expert Witness Fees Represent A Significant Portion Of The Witness' Income is a legal instruction used in the Cook County, Illinois jurisdiction. This instruction focuses on the unique circumstances where the expert witness's income largely relies on the fees earned from providing expert testimony in legal proceedings. In cases where expert witness fees are a significant portion of the witness's income, certain factors may come into play that might affect the credibility and impartiality of the expert. The purpose of this instruction is to guide the jury in evaluating the testimony of such witnesses and considering potential biases or conflicts of interest that may arise due to their financial dependence on these fees. Understanding the complexities and potential implications of relying on experts whose fees greatly contribute to their income is crucial for a fair and unbiased trial. By providing this instruction, the court aims to ensure that jurors are aware of these circumstances and can make informed decisions when assessing the evidence presented by such witnesses. Types of circumstances that may warrant this instruction include cases involving highly specialized fields, where only a limited number of qualified experts exist and rely heavily on their expert testimony income. It may also be applicable in cases involving ongoing expert witness relationships, where the witness regularly provides testimony for a particular litigant or law firm. Keywords: Cook Illinois Jury Instruction, expert witnesses, significant portion of income, expert witness fees, credibility, impartiality, biases, conflicts of interest, financial dependence, fair trial, unbiased trial, specialized fields, limited number of experts, ongoing expert witness relationships, litigant, law firm.