The police find a strand of hair at the crime scene. They determine that the hair belonged to a person that used anti-depressants regularly. How could they do this?

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The police find a strand of hair at the crime scene. They determine that the hair belonged to a person that used anti-depressants regularly. How could they do this?




Answer: Drugs enter the circulatory system and are carried all over the body. Some of this blood travels up to the hair follicles. The blood in the hair follicle can actually grow into developing hair, carrying traces of the drugs in the system with it.

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