Thanks Jim_TX for the suggestions. It might be worth looking into.
I have a feeling that this do not call list is one little piece of information that could be really damaging to Jehovah's Witness. If Jehovah's Witnesses have the freedom to knock on peoples doors, then people should have the right to say stop. And they do, they just don't realise it. Many people actually think they can get them to stop by just saying that they aren't interested.
I was in a hall once that had a lot of do not calls. It had a discouraging affect. It didn't make the ministry any easier because you had to keep checking the notes. If you went to one and got chewed out, you knew you were being persecuted for your mistake in failing to follow directions, not for something noble. It kept reminding you of how irritating the work was for the householders. There were so many, the elders couldn't keep up. Some would go for five years or more before they were updated.