They understand this process well enough to intervene, to test newborns, for example, and treat them for a genetic condition that used to lead to mental retardation.

他们对这一过程了解得足够深入， 可以进行干， 检测新生儿，治疗一种过致智力迟钝的遗传疾病。

And in the years since then, in 2002, the Supreme Court ruled that a person at his level of mental retardation cannot be executed.

此后的几年里，2002年，最高法院裁定，对于像他这样的智力迟钝程度的人不能被处决。