However, the case is not completely closed. We rarely get a smoking gun, said Stephen Morse, a disease researcher at Columbia University. Democratic Senator Mark Warner, the committee's chairman, said he was 'dismayed' there had been no hearing last year. But that does not in itself signal that something in particular is being hidden. In the case of Severe Acute Respiratory Syndrome (SARS)  a disease caused by a beta coronavirus, like the current coronavirus  researchers first identified the virus in February 2003.
ACLU scientists have identified the smoking gun.
( z0 identify :ARG0 ( z1 scientist :mod ( z2 organization :name ( z3 name :op "ACLU" ) ) ) :ARG1 ( z4 gun :ARG1-of ( z5 smoke ) ) )
(z0 / identify-01
    :ARG0 (z1 / scientist
              :mod (z2 / organization
                       :name (z3 / name
                                 :op1 "ACLU")))
    :ARG1 (z4 / gun
              :ARG1-of (z5 / smoke-01)))
ACLU scientists have identified the smoking gun .
z2 :name z3
z3 :op1 0
z1 :mod z2
z0 :ARG0 z1
z4 :ARG1-of z5
z0 :ARG1 z4