Rule 407 of the Federal Rules of Evidence
Definition
Provides that evidence of the subsequent remedial measures taken after an event which, if taken previously, would have made the event less likely to occur, is not admissible to prove negligence, a defect in a product, or a need for a warning. However, this type of evidence may be admissible for another purpose, including proving ownership, control, or the feasibility of precautionary measures, if these issues are in dispute.