In most cases, visual examination is not possible, so internal probes, X-rays and dental records are also being used.
In late August, BP released findings from its own internal probe, which it began immediately after the spill began.
An internal probe by Fox found there was no negligence on the part of either the network or producer Next Entertainment.
This led to internal probe being initiated at the GIA, which ran for four months.
Seoul National University announced this week it would conduct an internal probe into Hwang's research.
Do internal probes frequently turn out to be whitewashes?
Thus, the latter were admonished, and would submit themselves for internal probe by the United States Department of Justice.
Evans was cleared of wrongdoing by an internal probe.
A senior agent, Michael Kahoe, has been suspended in a subsequent internal probe of the apparent destruction of key investigation documents.
FBI headquarters announced that it was beginning an immediate internal probe into the way Salem had been handled.