I have no other motive other than to inform people on FR of the facts, the truth and in this case, the law.
There is no one court case, exigent circumstance law has been in place for many years. It covers:
a. Imminent danger to a person’s life or safety
b. Serious damage to property,
c. Imminent escape of a suspect, or
d. Evidence is about to be destroyed or removed
Go look it up for yourself - there is plenty to read about it.
Then go further - has it been abused? I believe it has and will continue to be abused. But, how to fight it? How to repeal it? You won't get far at all, as others have found.
In this case, everyone expected LE officers to track down and catch or kill the perp - no one dared stand in their way or be seen as preventing them from doing their job as swiftly as possible. If any had done so, they would have been made a pariah, and faced heavy fines and lengthy prison time.
Exigent circumstances law covers, as you say, “a. Imminent danger to a person’s life or safety, b. Serious damage to property, c. Imminent escape of a suspect, or d. Evidence is about to be destroyed or removed,” but only at a single residence, address, or building. I have read the cases I cited (twice), and none of them included broad searches beyond a single address or location. This was a widespread violation of the Fourth Amendment, not a lawful exercise of exigent circumstances.