Two layers of reality are manifested in the courtroom: that of the courtroom itself, the courtroom reality, and that of the events under examination in the case, the external reality. Both realities are represented through the language used in the courtroom. While interpreters tend to faithfully interpret language referring to the external reality, there are consistent and significant changes in their interpreted representation of the courtroom reality. Such changes may have significant influences upon evidence, and hence upon the outcome of the case. This paper presents the results of a detailed analysis of courtroom transcripts involving Spanish-English interpreting by four interpreters in Sydney, Australia, where consistent changes in the interpreted versions were found.