An analyst collects hair from a victim of a drug faciliated sexual assault. After cleaning, they cut it into 0.5cm segments and analyze these segments and find flunitrazepam at measurable concentrations. When the data is plotted as drug concentration on the y-axis and concentration on the x-axis, the points form a roughly linear pattern sloping downward. The indicates that

Question

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The linear pattern sloping downward indicates that the concentration of the drug is decreasing over time. This suggests that the dose was relatively recent, rather than several days or weeks in the past.

An Analyst Collects Hair from a Victim of a Drug