Do I have to check the National Do Not Call Registry before soliciting listings of those who have a for sale by owner sign in their yard or sellers with expired listings in the MLS?

Yes. You should check the do-not-call list before soliciting such listings to avoid violating the law.

There is an exception to the do-not-call rules: If you have a prior business relationship with the owner that ended within 18 months, you can call him. This exception does not apply if the owner has asked your company to place his number on the company do-not-call list.

There are no do-not-knock or do-not-mail laws that would prohibit these methods of soliciting business, so you could consider sending a nicely worded letter to the owner or making a personal visit to the home.