[Abra Cadabra IV]

Most of the human player penalties I saw at Los Angeles were due to human players grabbing balls before autonomous started, not using the tongs, and throwing empty cells over the outpost wall instead of through the hole. Teams in general were pretty good about not touching the super cell before they were supposed to. Instead, many of them got panicky near the end of the game and reached into the field to grab an empty cell instead of using the tongs.

All in all, most of these can be averted by a) making sure your human player knows the rules and b) picking someone who can be counted on to stay calm and not panic. My team didn't get a single penalty called on us the entire time, so it definitely is possible.