Detour Gel for Rats is an EPA-Registered, NSF-Certified, US-Patented, 100% non-toxic, chemical-free, contact repellent gel that has been proven to repel and deter rats and mice from congregating and returning to a home, business, warehouse, factory, workplace or other structures. The NSF Certification allows it to be used safely in health-sensitive areas such as restaurants, hotels, hospitals, convenience stores, supermarkets, schools, food storage rooms and food preparation areas.