(a) Subsequent Remedial Measures. When measures are taken that would have made an earlier injury or harm less likely to occur, evidence of the subsequent measures is not admissible to prove:
• culpable conduct;
• a defect in a product or its design; or
• a need for a warning or instruction.
But the court may admit this evidence for another purpose, such as impeachment or—if disputed—proving ownership, control, or the feasibility of precautionary measures.
(b) Notification of Defect. A manufacturer’s written notification to a purchaser of a defect in one of its products is admissible against the manufacturer to prove the defect.
Comment to 2015 Restyling: Rule 407 previously provided that evidence was not excluded if offered for a purpose not explicitly prohibited by the Rule. To improve the language of the Rule, it now provides that the court may admit evidence if offered for a permissible purpose. There is no intent to change the process for admitting evidence covered by the Rule. It remains the case that if offered for an impermissible purpose, it must be excluded, and if offered for a purpose not barred by the Rule, its admissibility remains governed by the general principles of Rules 402, 403, 801, etc.