As Americans consume more and more products from China and other countries with weaker consumer safety regulations, the case of Rainbow Apparel shows how persistent the problem of lead contamination can be and how, in turn, consumers may never know if their trinkets are safe. READ FULL STORY | MAP | VIDEO | CALIFORNIA WATCH

Joanna Lin is a data reporter for Reveal. She previously covered K-12 education and health for California Watch, a project of The Center for Investigative Reporting. She also was a reporter for the Los Angeles Daily Journal and the Los Angeles Times, where she covered breaking news and wrote stories on religion and legal affairs for the metro and national desks. A San Francisco Bay Area native and graduate of the University of Southern California, Lin is based in Reveal's Emeryville, California, office.