All 3 Uses

loophole
in
Change of Heart, by Picoult
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However, if his mission to donate his heart dovetailed with mine—to strike down the death penalty—then why not use the same loophole law to get what we both wanted?†
*

loophole = a gap in a rule, allowing avoidance of the rule's core intent
I was nervous, all right—and not just because this was a high-profile death penalty case that might or might not have found a constitutional loophole.†
"If you were to take her claim seriously," Greenleaf said, "you'd see that what she's really asking for is a legally binding sentence to be massaged, because of a loophole called religion.†

Definitions:

(1) (loophole)
a gap in a rule, allowing avoidance of the rule's core intent -- especially in the text of a law or contract
(2) (meaning too rare to warrant focus)
Less commonly, loophole can refer to a small opening in a castle that provides light and air, and allows an arrow to be fired from within. The opening is narrow enough that it is largely protects from incoming arrows.