Opening example — illegal immigrants. Singapore is able to enforce. Landlords are scared of confiscation if they provide shelter to an illegal immigrant.

I have the impression that U.S. schools and subway rules are not meaningful if not enforced. However,

* Look at GS and other private organizations and how they enforce their private policies
* Look at the military. Must have effective enforcement.
* Look at NASA.
* Singapore also has some high-profile failures of rule enforcement
** Pasir Ris mrt worker death

** cable car stuck in mid-air