Yep. They will ask some questions they can prove the answers to, and those will usually be the ones that implicate you. If you lie, they'll call all your other

Yep. They will ask some questions they can prove the answers to, and those will usually be the ones that implicate you. If you lie, they'll call all your other testimony into question, as well as get you at least one perjury charge! If you don't lie, you admitted to the crime you committed, and could have saved a lot of hassle by pleading guilty to begin with. If you plead the 5th, it's officially the same as if you'd never testified to begin with, but juries may still be biased to see that as you attempting to hide something you're guilty about. Better to avoid testifying at all.