As they say, the debates will be left to the dinner table. At that point, if the results were negative, they would be cleared to come out of quarantine. If it does, lets keep going. However, theres another issue at play, too. One already has to take the test within three days of departure, and now they have to be sure they get the results in time, or else they risk having to skip their flight and throwing off their plans.
Their certainty is of questionable.
( z0 question :ARG1 ( z1 certainty :poss ( z2 they ) ) )
(z0 / question-03
    :ARG1 (z1 / certainty
              :poss (z2 / they)))
Their certainty is of questionable .
z1 :poss z2
z0 :ARG1 z1