Because it is difficult for lawyers to know exactly what an interpreter might need, it is best to ask, and let the interpreter know as much of the basic information as is possible. Interpreters are bound by the same rules of confidentiality as lawyers, and contrary to a popular misconception, context does not interfere with the interpreter's neutrality. In fact, all the professional literature underscores the need for the interpreter to have context in order to render testimony accurately. Interpreting is more complex than most people imagine, and even the best interpreters will be challenged at one time or another by a linguistic or cultural difficulty. In a court setting, it is in everyone's interest to keep interpreters well informed so that they can do their best.
Attorneys are primarily concerned with the facts.
The interpreter is on the lookout for linguistic pitfalls. A short briefing, before the interpreter goes into action, is the best insurance policy against error and misunderstanding. Isabel Picado, Ph.D., was born in Costa Rica and currently works as a freelance cert fled interpreter in Massachusetts.