Figure legends.
Figure 1. Fixed IRT cutoff values by state. These results are for the first (initial) dried blood spot specimen.
Figure 2. Floating IRT cutoff values by state. All states but Texas and Colorado collect a single dried blood spot specimen. In the case of Texas and Colorado, the value shown is for the first specimen only.
Figure 3. Geographic distribution of fixed and floating IRT cutoff states. The stippled states collect two dried blood spot specimen and use a IRT/IRT/DNA.