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The scalp hair can be segmented, each centimetre of hair provides information on a window of approximately one month providing an understanding of the historical pattern of drug use.
If you do not segment you will get a result of Yes or No on whether the donor has used drugs in the testing period, this can include some potential carry over from the period prior to the testing period as significant usage stays in the system for some time.
If you segment the hair we can differentiate between carry over from the period prior to testing period, small usage, one off usage and regular usage.