Interestingly, it's a crime to lie to FBI agents even when one is not under oath. But, FBI agents lie all the time and get away with it. Double standards, anyone?
True. Lying to a Federal Investigator can get you a prison sentence. But if Federal Investigators lie under oath, it's ok then. It's because they're part of the Government. Fraud, waste, abuse, deceit, perjury, and lack of ethics are essential Government tools.