50 States, USDA Warn Of Mystery Seeds

Americans are receiving mystery seed packages, believed to be part of a brushing scam, in their mailboxes. The USDA warns against planting them due to potential threats to agriculture and the environment. The packages, often mislabeled, appear to originate from China. China's Foreign Ministry claims the packages are fraudulent and requests their return for investigation. USPS is coordinating with authorities to address the issue.

What potential risks do the seeds pose according to the warnings?

How does the brushing scam work as described in the text?