Lack of finance may affect the capacity of an accused or of a party in a civil action to secure the evidence, particularly scientific evidence, that he needs to locate and secure the attendance of witnesses (especially if they are not easily accessible geographically), to pay their travelling expenses and compensation for loss of earnings during court hearings, and to pay the fees of expert witnesses. A poor person may also face difficulties in preparing his case because certified copies of documents may be available to him only on payment of a fee.