Even in Cases Where Hair Samples Test "Positive" for Substances

question 27

Multiple Choice

Even in cases where hair samples test "positive" for substances of abuse,

• A)the hair sample does not accurately indicate when the substance was used.
• B)they also identify persons who were only exposed to a chemical, not just those who used it.
• C)you must wait 4-6 weeks for the hair to grow long enough to determine whether a person used a compound in the past 24 hours.
• D)the rate of hair growth is not variable, but is 1 cm per month.

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