So you have near 100% of effectiveness if you find near 100% of them, dead or alive. Given that there are probably a significant number of cases where the perso

So you have near 100% of effectiveness if you find near 100% of them, dead or alive. Given that there are probably a significant number of cases where the person is actually dead and never find their corpse I doubt that near 100% effectiveness can ever be claimed. Also I expect this effectiveness to be defined as (found out fakers)/(all fakers), and it's pretty damn hard to predict the number of fakers you know nothing about. Maybe one can introduce fake fakers to measure the investigators, but it's also susceptible to all kind of biases.