...But the thing is, there is no law. We see drones who cull because a troll is crippled or unable to fill buckets, but there's never any mention of an organized authority figure that dispenses justice. Vriska killed thousands- we can assume seadwellers were in the fatalities too- and did anyone come to punish her? Nope. It was Aradia and Terezi who took her down, and they literally only did it to get revenge for themselves.No here's how it works, unjust murders of a highblood, and in some cases, mindless massacre of the lowbloods, anything that would label you a particularly dangerous troll, would make you a criminal.
Extrapolating on this, we can assume that all legislacerators and other types of law enforcers are strictly operating in space, for the adult trolls. Alternia is very much a survival of the fittest scenario- "if you need the cops to come help you, you're too weak to survive anyway" type deal.
If your troll is being pursued, just write it off as them being pursued by their murder victim's moirail or matesprit or friends or what have you. Makes things much simpler. B)