>>18844678Depends on the consent laws of the state, Could either be 1 party or 2 party. If it's a 1 party consent state, all it takes is 1 person engaged in the conversation to be aware that it is being recorded, then it's legal. In a 2 party consent state, both need to be aware that it is being recorded.
3rd party recording is generally illegal if not given forewarning, or express permission by the courts. (which is why law enforcement agencies are supposed to get court orders for wiretaps and the like.)