Final answer:
The caller ID for a reporter can be used when the reporter consents, in mandated reports, during emergency situations, but generally not for anonymous reports, respecting the 'reporter's privilege' which protects the source's identity. Notable examples of confidentiality in journalism include the case of Edward Snowden and the use of 'reporter's privilege' in sensitive investigations.
Step-by-step explanation:
The question is about the circumstances under which the caller ID for a reporter can be used. The caller ID can be shown when a reporter consents to have their number identified by the recipient. This consent is crucial for protecting the reporter's privacy and ability to control their own contact information. In cases where there is a mandated report, such as situations where legal requirements must be fulfilled, the use of caller ID may be justified. Conversely, for anonymous reports, the whole purpose is to keep the identity of the reporter undisclosed, so caller ID would typically not be used.
This privilege has led to crucial journalistic investigations and the outing of significant issues like government surveillance programs. One notable example was the case of Edward Snowden's 2013 leak, where confidentiality was paramount for the source's safety and the public's right to be informed.