Technology which visualizes foreign trade routes on galaxy map in sensor range(you need to see it once when you knows that here is a trade route). After this you can assign Raider Fleets which has chance to rob target trade routes in some radius(+dust +sci depends of faction robbing bonuses for raider empire, -dust -sci depends of faction trade bonuses for trading empire). Police fleets are also has chance to intercept raiding in some radius. Raiders vs Police space battles only autoresolving with reports. You can design your raider ship or police ship. You pays maintenance cost for your raider/police CPs. Raiders looks as pirates to trading empire, you can develop tech to has chance to identify which empire is raiding.

Renamed title.