FIGURE 4.
Oral fluid concentrations of methamphetamine (METH) for subject AA following single-dose oral administration of 10 and 20 mg of methamphetamine on two sequential days. Oral fluid was collected by use of sour candy. The arrows represent time of methamphetamine administration, and the dotted line represents the recommended DHHS cutoff concentration of 50 ng/mL for methamphetamine in oral fluid.