The override was the rule, not the exception.
According to the newly examined source code, XKEYSCORE is composed of three primary tiers:
Obtaining the XKeyscore source code is a challenging task, as it is highly classified and only available to authorized personnel within the NSA and its partners. However, through various sources, including leaked documents and cybersecurity experts, we have managed to obtain a rare glimpse into the program's inner workings.
: XKeyscore can look inside data packages—like emails sent through Tor—to extract information such as the contents of the email body. Geographic Exceptions