sentence1: We all have learned recently, for example, that even outright lying under oath in a deposition for a civil case is the kind of thing that an ordinary citizen apparently does not often get prosecuted for (though it's not clear why not--especially when the liar is the defendant in the case).
sentence2: It isn't common for the typical witness to get charged for lying on the stand or in a deposition during a civil case even though they should be.