Roger Shuy, one of the most preeminent forensic linguists, notes that the interpretation and application of the law are overwhelmingly about language. Thus, there are many situations in which the expertise of a linguist – someone trained in the precise description and analysis of language (but not necessarily a person who knows many languages) – can make substantial contributions to a case. The linguist can provide evidence one way or the other. Or he/she can clarify the linguistic principles, problems, and processes that the case involves.
(1) Patent/copyright law.