A toxin was released into the atmosphere. 99% of people were infected, and then the toxin diluted to a negligible state. The infection is passed down generations. There is no possible cure or way to reduce the symptoms, but we don't know that.

This infection gives humans, and only humans, super-strength and super-hard skin. There is no possible material stronger or harder than an infected human, but we don't know that.

Handcuffs, super-strong walls, and even extra-hard diamonds can be torn apart as easily as a sheet of paper by infected humans. There is no possible way to detain a conscious human without being restrained by another (stronger) human, but we don't know that.

Nothing exists, nor can be created, that would pierce an infected human's skin, but we don't know that.

Infected humans are immune to all potential sedatives, but of course, we don't know that.

The fact that we don't know these things is not ignorance. We realize there is no current solution. We just don't know that there is no potential future solution to these matters.

How would laws be enforced?