Question

What might analysts be able to use tunable lights for?
A.
to detect traces of narcotic substances on paper
B.
to detect how deep a wound is
C.
to detect counterfeits or altered documents through testing for abnormalities in ink
D.
to detect whether a suspect is lying by looking for tiny wrinkles around the eyes

Answer 1

C. to detect counterfeits or altered documents through testing for abnormalities in ink