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60° Clear
- San Mateo, CA (94402)
  Today
  
  A mainly sunny sky. High 82F. Winds W at 10 to 20 mph..
  
  Tonight
  
  A few clouds from time to time. Low 56F. Winds WSW at 10 to 15 mph.
  
  Updated: June 12, 2026 @ 12:07 am
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Health

How much pot in that brownie? Chocolate can throw off tests

By CARLA K. JOHNSON AP Medical Writer
Aug 26, 2019

How much marijuana is really in that pot brownie? Chocolate can throw off potency tests so labels aren't always accurate, and now scientists a…

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