1.   However, researchers will first have to do at least seven years of testing to show that the strategy is safe and effective.

2.   In all, the researchers will have to do at least seven years of testing to show the strategy is both safe and effective.

3.   That responsibility belongs to the property owner, Flynn said, who must submit testing to show the place is safe for occupancy.

4.   We did testing that showed they were identical, yet they were markedly different in their behaviors and physical appearance.