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According to the passage, scientists claim that the projectile they are developing ----.
A new and quicker method to check or prove the
existence of weapons of mass destruction (WMD) is
being developed. First, one needs to know where
they may be hidden and then a high-velocity
projectile can be fired at the target. High-tech
sensors packed into the projectile will then instantly
beam back confirmation that the weapons are there if
indeed they are. It's a high-risk concept that raises
many questions, not least its technological feasibility
and the political protests that would follow if such a
device were ever built or used. But the US military is
taking the idea seriously. Last year, in a two-page
research paper commissioned by the army, experts
from the Institute for Advanced Technology detailed
real test results of a prototype projectile designed to
verify the existence of WMDs. They say such a
device offers a way to inspect for weapons without
permission or cooperation. To inspect reinforced
concrete bunkers or factory buildings suspected of
housing WMDs, the researchers designed a
projectile that can penetrate several meters of
hardened concrete, without damaging its load of
sensors. Its casing is built from AerMet 100, a nickelcobalt
steel with traces of molybdenum and
chromium. Heat-treating the casing after it is made
gives it an extremely hard surface. The tapering
projectile is 230 millimeters long, with a maximum
calibre of 45 millimeters.