This regulation establishes a tolerance for residues of thifensulfuron methyl in or on canola, seed; cotton, gin byproducts; cotton, undelinted seed; and flax, seed. E. I. DuPont de Nemours & Company requested this tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA). In addition, this regulatory action is part of the tolerancere assessment requirements of section 408 (q) of the Federal Food, Drug, and Cosmetic Act (FFDCA) 21 U. S. C. 346a (q), as amended by the Food Quality Protection Act (FQPA) of 1996. By law, EPA is required to reassess 100% of the tolerances in existence on August 2, 1996, by August 2006. This regulatory action will count for 10 reassessments toward the August 2006 deadline.