In Roper vs Simmons, the US Supreme Court ruled that juvenile
defendants can no longer be sentenced to death in a capital trial.
They cited information submitted by the American Psychological
Association showing that age is correlated with impulsiveness
(young people are often impulsive, a factor that might lead them to
commit a homicide). Imagine the Court is unsure whether to
categorize 16-, 17-, 18-, or 19-year-olds as adults or as
juveniles. However, they do have an impulsiveness threshold. If...