No you can't invoke 5th amendment. You are givin immunity when you are subpoenaed as a state's witness. Thus you are not testifying against yourself which is what 5th amendment protects you from. You have to answer the questions or you can be held in contempt of court for months at a time. If you lie, that's perjury. In my case they did this to me in gainsville Florida. Although my memory was very bad that day and I could not recall any answers to there questions. It all seems to have slipped my mind. This is a tactic they use to gain a monopoly of witnesses for the state. They will cross examen any witness they find out to be favoring the defendant.
Antagonizer
