I vaguely remember a mention in the History of Rome Podcast where Mike Duncan said a reformer put curses or hexes into a law to deter others from attempting to repeal them in the future. I'm not sure if it was the Gracchi land reforms, Caesar, or someone else, or if it was a common tactic over the years. Does anyone have any evidence of this happening or, short of that, do you remember which episode mentioned it?
I think without a reference to the statement in issue there is little of hope of clarifying the matter. On the subject though, you will find this, probably one of the finest exhibitions here by /u/XenophonTheAthenian, which should clarify the matter on this point. (1) Further, I think we have one curse tablet preserved aimed at a senator, but this is in an entirely different context that is inquired about. (2) Lastly, speaking about Legal curses (defixiones iudiciariae) per se ( they were informal and not a part of Roman law and again, completely different context than implied in the questions´ subtext ), it was a curse against the party in a sense from hindering him to attend the judicial proceeding due to various misfortunes, or to otherwise be unable to represent oneself - thus oft a curse of muteness in this instance.