In Ed Greenwood Presents Elminster's Forgotten Realms, there is an entire section devoted to local laws and edicts of the Sword Coast, including property law, trade laws, and sentencing the guilty.
For instance, on p. 46:
Attacking Secomber: "This crime is defined as invading Secomber with intent to murder, pillage, or set fires; the act of deliberately poisoning or fouling any food, water, or drinkable in Secomber; casting spells to cause building collapses or effects reasonably expected to cause multiple deaths; or damage to city gates. If observed in the act by a Rod or Watch member, the offender is killed on the spot; otherwise the punishment for conviction is death."