If you were one of the many that embraced an exploit in The Witcher 3 that had you taking to The White Orchard and slaughtering cows, you're being hunted. The latest expansion for The Witcher 3, Hearts of Stone, comes with more than just 10 hours of gameplay – it comes with the tax man, Walthemor Mitty.
Mitty will stop you and ask you a number of things – specifically whether or not you've "engaged in the wholesale trade of rawhide in the White Orchard area." In fact, he goes on to address other exploits on top of that one, there's nothing you can hide from the tax man (an all to real situation).
Players can choose to deal with Mitty one of two ways, by either admitting to taking part in exploits or by saying they never have. Admitting to such actions will get you a diploma for your honesty and saying that you never took part in the activity won't penalize you (even if you have).
Check out Mitty's investigation in action: