When a toxic substance or drug enters the body, it reaches the hair root (follicle) through the blood. There, these substances adhere to the hair material (keratin), and as the hair grows, this information is also preserved along with it.
A simple example is as follows. Hair grows about 1 centimeter every month. If you cut a hair into 3 parts, each 1 centimeter long, each part can tell about a history of approximately one month.
What does this reveal?
Experts can determine through hair testing when the poison or drug was taken, how much was taken, whether it was taken once or repeatedly as a habit.
What can be detected?
Heavy metals like lead, mercury, arsenic. Various drugs and narcotics.
But remember one thing:
This method is not 100% complete because dyeing or bleaching hair can alter the results, and external contamination can also have an effect. The rate of hair growth can vary slightly among individuals. Hair truly retains a record of the past, but understanding this record requires caution and expertise.
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