One of the reasons I Am Not A Lawyer is this: If the business is allowed to send its customers a form letter telling them that hey has given the master key to

One of the reasons I Am Not A Lawyer is this: If the business is allowed to send its customers a form letter telling them that hey has given the master key to the government, I would understand the position that the interests of the other customers were reasonably safeguarded. If, for example, one of them was discussing some business and then suspicious trading occurred, she might ask whether a government employee abused the master key and was doing some insider trading on the side. But if the business is not allowed to tell the customers that their privacy has been compromised, I would not want to give the government the "benefit of the doubt" about their use or abuse of a master key. Trust, but verify, as they say. How does one verify when these security letters are handed out like candy?