The Biowatch principle that unsuccessful litigants in constitutional litigation against the state should not pay costs is not inflexible. Where a litigant's conduct is vexatious, frivolous, professionally unbecoming, or abusive of court processes, the court may depart from the general rule and award costs against the litigant. Additionally, where proceedings are withdrawn under Rule 41(1), 'very sound reasons' must exist for a respondent not to be entitled to costs, and it is only in exceptional circumstances that a party opposing withdrawn proceedings will not be entitled to all costs caused thereby.