1.   Campbell, who heads a field research station in Hilo, has been working with the state to experiment with a pure caffeine spray to control the frog population.

2.   The caffeine spray causes cardiac failure.

3.   The caffeine spray would presumably cause the frogs to go into cardiac failure.

4.   The state Department of Agriculture requested an exemption from federal law to allow the use of a pure caffeine spray to control the population of the amphibians.