Starfield gives players the opportunity to start a new life in the vast darkness of space, but when it comes to being a notorious criminal, the bounty system could use some improvements. It can be difficult to make a name for oneself as a deadly pirate or assassin when it's so easy for NPCs to witness crimes: Starfield's default bounty mechanic is triggered if any NPC witnesses a crime and remains alive for longer than 30 seconds. This can prove difficult when dealing with groups, which is why this mod is so useful.
Posted to Nexus Mods by creator EgoBallistic, the "Leave No Witnesses" mod improves the bounty system by eliminating the 30-second timer attached to witnesses. This means anyone who bears witness to the player committing a crime can be eliminated during an encounter, thus making it harder for bounties to be placed. As long as no witness is left alive, NPCs won't be able to report back to the authorities, making a life of crime more viable as a career.
Writing about the benefits of the mod, EgoBallistic notes that the add-on should make piracy much easier since players can "avoid the massive bounties from destroying ships"...