Jesalyn Harper, the only full-time code enforcement officer for the small, agricultural city of Reedley in California's Central Valley, was responding to a complaint about vehicles parked in the loading dock of a cold-storage warehouse when she noticed a foul smell and saw a garden hose snaking into the old building. A woman in a lab coat answered her knock, and behind her were two others in plastic gloves and blue surgical masks, packing pregnancy tests for shipping. Harper said they spoke broken English and told her they were from China.