The Produce Safety Rule is a federal regulatory program. This means, if your facility is subject to the rule, there is no opting out. If a farm does a USDA Good Agricultural Practices (GAP) audit and is also subject to the Produce Safety Rule, the farm must follow the requirements of both. There are many third-party food safety audits beyond the USDA GAP audit. Even if your farm is participating in another audit like a PRIMUS, GlobalGAP, USDA Harmonized GAP, etc. you are required to follow the Produce Safety Rule and the other audit standards.