I'll offer my "rag doll testimony" IANAL axiom: re the 5th Amendment (right against compelled self-incrimination) the court can only "compel" your "testimony" insofar as they can manipulate your limp uncooperative body for fingerprints, hair samples, and other non-invasive observations. Anything inside your body, including blood & ideas, is yours to retain as you see fit.<p>Not perfect, but seems generally sensible. Have at it.