Drugs use different mechanisms to incorporate and fixate into the hair, and these are useful to determine if a person is currently consuming drugs or not, and for how long. Option B) Drug use is currently happening.
<h3>How are drugs incorporated into the hair?</h3>
Several studies have been done to explain drug incorporation mechanisms in hair. Among different mechanisms, the most significant ones are,
- Active or passive diffusion from blood to the dermal papilla from which hair grows.
- Through sweat and other secretions.
- From the environment that might deposit drugs on hair.
Usually, before making a drug analysis, hair must be washed to avoid considering external environmental drugs deposited on hair (the last option).
Once drugs incorporate into the hair, they bond to different components composing highly stable complexes that can not be altered for several years. In fact, drugs can remain in the hair for hundreds of years.
According to this information, if after the analysis drugs were only found in the hair root, it might suggest that drugs are recently and currently being consumed.
Option B is correct. Drug use is currently happening.
You can learn more about hair drug analysis at
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