[#item_full_content] Nearly one in five workers in the general U.S. workforce, 19.1%, tested positive for drug use based on hair specimen analysis collected in 2025, an increase of nearly 46% compared to 13.1% in 2021, according to the 2026 Quest Diagnostics Drug Testing Index™. Hair test positivity for marijuana increased 58.9% over the past five years … Continued 
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