Only certain labs test hair.... it remains controversial.
Blood testing is the best IMO.
Urine is sometimes done, also. It depends on the doctor and hospital.
There were articles on hair testing on Google, saying only really good labs can be trusted to do hair. Hair testing is done forensically in crimes, to detect poisons, and also to set a time interval.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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