When crime scene investigators arrive at the place of a crime, they first try to make sure the area is secure.
VOA: special.2010.05.05
In contrast, when Twitter launched its new re-design in September, users were given the option atfirst to try out the new version, but go back to the old one if they wanted to.
Regulators at both the FDA and the Centers for Medicare and Medicaid Services may see reason to try to restrict use atfirst to the highest risk patients.