Fascinating post! I love it when interpreters & translators take charge* appropriately. I know in the ASL-English interpreting world, our Deaf consumers usually do no like it (to put it mildly) when Hearing interpreters "take control." They see it as paternalistic, disempowering, and arrogant. However
, there are times when it is foolish to do nothing, say nothing-- especially when you are only dealing with human clients on one side of the language divide! I'm sure the documents weren't offended that you told the American attorneys it was a waste of your time to translate them. You saved them a lot of time and money. I have saved people time and money by telling them a situation did not need two interpreters. I am an advocate of team interpreting, and I cannot work alone for more than 20 or 30 minutes of continuous speech, but when it's really sporadic, I don't need a team. To be fair, I would discuss this with the other interpreter to see which one of us feels they need the job. If they would have kept quiet about the surplus of interpreters, and I have reason to believe I will get work elsewhere, I will offer to be the one to turn back the job (I'm talking about repeating or continuous assignments).
Now, to your other issue: You didn't just save them time and money; you used your knowledge to help them get what they wanted. This is a good ethical dilemma. I think most of us do this sometimes whether we know it or not, but occasionally it's a decision we deliberate. I once interpreted a video relay call for an hour where the Deaf caller was trying to get some information specific to services to the Deaf, but no one she connected to or was transferred to was aware of the services they provide. I was well aware, because I had interpreted many calls to this company before. After a painful hour of keeping my knowledge to myself, I finally decided to do something. I said, "Excuse me for a moment," in English, which made it sound like the Deaf caller had said it. I then suggested to the Deaf caller that they Google a specific string of search terms. They did, and they found what they had been looking for for an hour. I asked the Deaf person to please not tell the Hearing person I had told them. The Deaf person thanked me and understood my request, and simply said, "Don't you people use Google to find information about your own company and help customers? I just Googled [such-and-such] and found it right away!" Luckily, in this case, the Deaf person felt no resentment at me for "taking control" because I really didn't take control; I simply provided one client with information that would help them and not hurt the other client (after all, the Hearing client would get the Deaf client's business if they just knew where to point the Deaf client). I was able to do this without saying to both parties, "Okay, hold on, people. I know the answer and this is what it is." I have often wanted to do that as an interpreter, but I almost always bite my tongue / site on my hands. ;-)
By the way, I armed myself with this tenet of the Code of Professional Conduct developed in cooperation between the National Association of the Deaf and the Registry of Interpreters for the Deaf:
Tenet: Interpreters possess the professional skills and knowledge required for the specific interpreting situation.
Guiding Principle: Interpreters are expected to stay abreast of evolving language use and trends in the profession of interpreting as well as in the American Deaf community.
Illustrative behavior 2.6: Judiciously provide information or referral regarding available interpreting or community resources without infringing upon consumers’ rights.
I felt my behavior was ethical, especially since the information I provided was specific to "available interpreting or community resources" and I didn't infringe on anyone's rights.
* I looked up the word "charge" just now to see if I wanted to use it, and this is the operative definition I found: "the responsibility of taking care or control of someone or something" (American Heritage Dictionary in Mac OS X). And look at the word "responsibility." Rather than looking at it as a "burden," I like to remember that it is the ability to respond! Also, "charge" can mean power. Power is not a bad thing if used for good.