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.