Oregonaut wrote:The only thing that keeps most bad things from happening is a lack of desire to continue to do them.
Also, it's hard to travel between cities with some kind of transport footprint. After 2-3 murders are linked, just look for car registrations that entered/left the city within x period... The killer would have to change car every time, pay only in cash if on public transport, take erratic and unconventional routes as decoys, and avoid any terminus that has cameras. To arrive in a city, kill, hide all evidence, leave a city and arrive at the next city without leaving a trace of your movement would be too hard. Finding a city that doesn't have traffic cams on its main routes - or easy entrance and exit through non-main routes, within a few hours drive of the city you're in (also with no traffic cams &/or non-main routes), would be kind of hard. By the third day, they'd be able to predict the killer's movements, based on the dude's travelling pattern and set up a checkpoint in likely routes. The killer couldn't rent a car, as you'd have to return it to the previous city. If the killer rented at OMGitHertz in Murder City 1, then traded it for a new car in Murder City 2, the police, with one telephone call, would ask "did someone rent a car in murdercity1 and exchange it in murdercity2?" "Yes. A man by the name of Stabby McDisemboweler". Even if they went as far as buy
a car each time, you have to provide all sorts of identification and proof of address. Three cities, three cars, three IDs. Quite tough, when you consider that spy that was caught a few years ago carried four IDs, and he was governmentally sponsored. Couldn't travel by plane, either, as you might as well leave a trail of breadcrumbs between each murder victim. In short, it's too hard to do the Daily Murder Dash, as it's far too easy to find people who move between cities, particularly in such a short space of time. Also: who the hell knows the layout and intimate details of more than one city--two tops--to be able to murder someone and know exactly who to kill/where to dispose/how to avoid *not* being recognised? Even cities have communities and it only takes one person to go "oh last night there was this guy I've never seen before. Quite odd. Brown hair, red eyes, cold heart, tattoo saying i♥shovelin' on their forehead".
Police Detectives. They're, uh, kind of smart. Also they have many people studying endless footage of people and vehicles for 24-hours a day, 7 days a week.