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.
the case is not fully closed. we rarely get a smoking gun.
( z0 multi-sentence :snt ( z1 close :ARG1 ( z2 case ) :ARG1-of ( z3 full :polarity - ) ) :snt ( z4 get :ARG0 ( z5 we ) :ARG1 ( z6 gun :ARG1-of ( z7 smoke ) ) :ARG1-of ( z8 rare ) ) )
(z0 / multi-sentence
    :snt1 (z1 / close-01
              :ARG1 (z2 / case-03)
              :ARG1-of (z3 / full-09
                           :polarity -))
    :snt2 (z4 / get-01
              :ARG0 (z5 / we)
              :ARG1 (z6 / gun
                        :ARG1-of (z7 / smoke-01))
              :ARG1-of (z8 / rare-02)))
the case is not fully closed . we rarely get a smoking gun .
z3 :polarity 0
z1 :ARG1-of z3
z1 :ARG1 z2
z0 :snt1 z1
z4 :ARG1-of z8
z4 :ARG0 z5
z0 :snt2 z4
z6 :ARG1-of z7
z4 :ARG1 z6