D/R Demonstration/Research Category: This subcategory requires certification in a primary category. For commercial/noncommercial applicators who demonstrate to the public or conduct research on the use of pesticides when exceeding label provisions. Topics include setting up demonstration and research plots/designs, calibration, equipment, recordkeeping, safety. Content supplements information in Nebraska’s General Standards (00) core manual. Recertification and relicensing is required every 3 years for both this category and General Standards.