snip ...
Fast-forward to the 1990s and Senator Patrick Leahy*, who proposed a different approach.
Since the 1970s, though, very few countries were actually cut off from U.S. aid because...well, strategic interests kept winning. The interest in keeping money flowing from our pockets into the pockets of the industrial-military complex, was the big one.
And to do that, the U.S. couldn't be too particular about human right abuses. So, they frequently invoked a convenient little exception called "extraordinary circumstances." If the administration determined that extraordinary circumstances justified it, then they didn't have to pull funding for the country. And almost every circumstance turned out to be extraordinary.
Senator Leahy saw that Section 502B wasn't really working. That even when governments were committing abuses right, left and center, the administration chose to ignore it. So, he proposed a solution. Leahy said, (I'm paraphrasing) Look, if you're not going to stop funding whole countries like Colombia, where paramilitary forces are committing gross human rights violations as we speak, then what if we stop funding only the specific military or police unit committing the abuses?
That idea became the Leahy Laws.
* - a Democrat