Came up with a small yet dastardly new rule last game to a) increase the incidence of being arrested (which happens maybe once every 100th game in my experience) and b) make a few of those bothersome 1-toughness monster draws like cultists and maniacs a little more interesting...
Whenever an investigator kills a human(oid) monster* in combat, s/he must then pass an Evade check against said monster's awareness modifier or be Arrested. The rationale being that even if the miscreant you just killed was a bloodthirsty acolyte of a gibbering transcosmic abomination, the law would still likely want a word with you after your having blown him a third corn-chute with your unlicensed 12 gauge.
* Monsters potentially affected: Cultist, Maniac, Tcho-Tcho & Tcho-Tcho Priest, Deep One Hybrid, Warlock, Witch, Werewolf (reverts to human form upon death?), Barnabas Marsh, Dark Druid, High Priest, Priest of Dagon, Wizard Whateley.
