The Blue Tag Certified Turf Grass program is a voluntary program which allows third party, unbiased inspections of turf grass to ensure the consumer that he receives the variety he has purchased. The purpose of Blue Tag Certification is to promote the genetic identity and purity of the turf and to ensure freedom from most noxious or objectionable weeds. Blue Tag Certified turf grass will be accompanied with a certificate upon delivery, if there is no certificate (see below) then the sod is not Blue Tag Certified. The Tennessee Crop Improvement Association, Inc. is the only formally recognized turf grass certifying agency in the state of Tennessee.