If LE busted a provider, other client is on her book which is really a third party verification. LE can set up a sting and busted the third party verfication and got a list of people, and your name is on it. Will you get into trouble?
Can you argue I didn't do anything?

Because your nane is in a book..does not prove anything..unless there is reasonable cause to really come down on you..and if this were the case..phone records of calling between the parties could establish a conection..If contacted by them..say nothing..do nothing..and contact a experienced lawyer.