CFR > Title 7 - Agriculture > SUBTITLE B—Regulations of the Department of Agriculture > CHAPTER I—AGRICULTURAL MARKETING SERVICE (Standards, Inspections, Marketing Practices), DEPARTMENT OF AGRICULTURE (parts 27 to 206) > SUBCHAPTER E—COMMODITY LABORATORY TESTING PROGRAMS (parts 90 to 111) > PART 91—SERVICES AND GENERAL INFORMATION > SUBPART D—Laboratory Service (§91.15 to §91.18)