One has to believe that law enforcement forensics folks have the wherewithal to distinguish a stray image in browser cache, from a large downloads folder full of similar content.

One has to believe this, for their own sanity.

One does wonder though, particularly in countries with increasingly-weakenened rules of law.

I ran a social media site years ago, had a few instances of CP where we personally notified law enforcement. It was taken care of, we got in absolutely no trouble. But it's worrying how inefficient the whole process is. Or at least was back then.