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For some drugs, metabolites may be detected in urine for up to four days after use

Considering the geographical differences within China, this study collected data from various regions across the country

For example, there are exceptions for "business/regulatory purposes" (shipping between licensed businesses) and "certain individuals" in non-contiguous states like Alaska or Hawaii, but these require specific paperwork and authorization from the Postmaster

This suggests that, on average, participants are aged around 40 years, 92% are male, the average education level is slightly below a Bachelors degree, the average income is around 130000 RMB, 76% of participants are in a married, divorced, cohabitating, or widowed status, and 75% of participants have children