How to Use "efficacy" with Example Sentences

1. There are limits to the efficacy of the food safety simulator .
2. They also say this argument should not be just about short-term efficacy , but morality as well .
3. But policies that have delivered in the past are losing their efficacy .
4. Properly operating lagoons have also been studied for efficacy .
5. Yet some freudians worry about the efficacy of short-term , long-distance programs .