Mostly yes, but only at a no-brainer level... if you commit theft, murder or similar, you should expect consequences. Obviously, if you don't get caught it doesn't matter, so the characters are more likely to get away with a crime committed in the wilderness than in a place full of witnesses.Obviously every group has their own taste for such mundane and boring things, but I am wondering how many groups actually enforce laws in their games, as far as it is appropriate, and how many simply ignore laws or let it slide to keep the game going.
Most RPGs are after all power fantasies (at least thats my impression) and PCs often end up in the role of vigilantes or judge, jury, executioner which is not quite compatible with being a law abiding citizen, no matter what your alignment says (In D&D, but I wanted to keep it a bit more open, thus I post in the general forum).
So, do you enforce laws in your games? And which ones? Only the big ones like murder or do you have bridge tolls, taxes, sumptuary laws, etc.?
In general, I don't have the fantasy setting follow modern standards at all, not just in law enforcement but also in economics, technology, knowledge etc. So it's not like if the characters commit a crime then there will be an investigation, an arrest, a formal trial... more probably the matter will be handled summarily, or someone is going to make them pay in another way: perhaps a bounty hunter will be hired to retrieve what they stole, assuming it's valuable enough, or to exact revenge. If the victims are poor folks, rumours will spread that the PCs are criminals, and doors will be shut in their faces (although other doors may open, if the players want to go that route). The general principle is you reap what you saw, and if you start behaving like villains, that's what you'll be treated like.
As for taxes and various legal obligations, it's just assumed in the background that everything is in order, and your taxes are already taken into account in "costs of living" expenses, which by the way we usually even ignore... just assume that if you found 100gp of treasure this week, the taxes are already deducted Then of course once a while there might be a new city to visit, where they ask for a specific entry toll or document to produce, it can be part of the narrative, but it's not going to be a frequent chore.