The Signal-to-Noise ratio is quite low. There are actually quite a lot of false positives, including... 1. Declassified/Released documents. Many historical do

The Signal-to-Noise ratio is quite low. There are actually quite a lot of false positives, including... 1. Declassified/Released documents. Many historical documents are no longer classified, yet some had its original classification markings. The same goes for commercial documents. For example, the Trump-Russia dossier was a previously classified document of a private company. 2. Whistleblowing documents. These documents were released by whistleblowers, thus no longer private and classified. You can find many NSA documents leaked by Edward Snowden hosted on Amazon AWS owned by news websites. 3. Boilerplate classification. Many commercial documents have boilerplate classification, regardless of whether they are truly sensitive or not. It's very common to find technical documents and datasheets with "Confidential" markings, which should have been removed long ago, probably related to (1). In my experience, these documents make up 85% of the search result, only less than 15% of the documents in the search result are truly security breaches and confidential.