An experimental use permit is a tool that allows an unregistered pesticide to be used, or a registered pesticide to be used for an off-label use, under controlled, field or actual use conditions so that data required to support a FIFRA section 3 registration can be developed (e.g., data necessary to evaluate efficacy and potential for safe use or adverse effects on humans and the environment such as a swimming pool use).

All of the inerts used in the product must be either approved or pending with the Agency for the applicable uses.

The Agency will provide the applicant with a pre-decisional determination 2 weeks prior to the PRIA decision review time due date which specifies any label changes that have to be made in order to grant the requested experimental use permit. If the label issues cannot be resolved prior to the PRIA decision review time due date and if a PRIA due date time extension has not been agreed upon, then the Agency will issue to the applicant its regulatory decision with the specific label changes and supporting documentation on or just before the PRIA decision review time due date. At that time the applicant must either (a) agree to all of the label changes and submit a revised label that incorporates all of these label changes; or (b) does not agree with one or more of the label changes and request up to 30 days to reach agreement with the Agency and submit a revised label that incorporates all of the agreed upon label changes, which the Agency has 2 business days to review; or (c) withdraw the application without prejudice.