Contamination from genetically engineered (GE) crops poses serious risk to organic seed integrity, impacting the viability of organic farmers and credibility of organic products. Organic seed is the most critical link to producing organic products free of GE contaminants. The Contamination Avoidance and Testing Protocols Project (CATP) seeks to provide organic seed farmers with a Farmer’s Manual with protocols offering guidance on seed contamination avoidance, seed practice adherence standards, and case studies that showcase “best practices.”