A lien search is a procedure done to clear the title of a property to transfer it to another person. Lien searches are excellent if you want to find all the liens of one specific person. However, it wouldn't be enough if you're going to search a property's possible liens.
Moreover, these searches can discover all the properties of one person, which is good in inheritance cases where everything isn't fully disclosed in the will.
This can help the heirs find all the properties and get a hand on them before losing them forever to whichever state they live in.