At some point, we will probably settle on the red planet. In a fascinating article from 2018, The Atlantic wondered how we'll police it:
Consider the basic science of crime-scene analysis. In the dry, freezer-like air and extreme solar exposure of Mars, DNA will age differently than it does on Earth. Blood from blunt-trauma and stab wounds will produce dramatically new spatter patterns in the planet’s low gravity. Electrostatic charge will give a new kind of evidentiary value to dust found clinging to the exteriors of space suits and nearby surfaces. Even radiocarbon dating will be different on Mars, [UC-Davis archaeologist Christyann] Darwent reminded me, due to the planet’s atmospheric chemistry, making it difficult to date older crime scenes.
The Martian environment itself is also already so lethal that even a violent murder could be disguised as a natural act. Darwent suggested that a would-be murderer on the Red Planet could use the environment’s ambient lethality to her advantage. A fatal poisoning could be staged to seem as if the victim simply died of exposure to abrasive chemicals, known as perchlorates, in the Martian rocks. A weak seal on a space suit, or an oxygen meter that appears to have failed but was actually tampered with, could really be a clever homicide hiding in plain sight.
Imagine a criminal armed with a knife has been cornered on a Martian research base, near a critical airlock leading outside. If police fire a gun or even a Taser, they risk damaging key components of the base itself, endangering potentially thousands of innocent bystanders. Other forms of hand-to-hand combat learned on Earth might have adverse effects; even a simple punch could send both the criminal and the cop flying apart as they collide in the reduced Martian gravity. How can police overpower the fugitive without making things worse for everyone?
And then there's the surveillance....