Why have I already found these two guilty?

British girls in Ghana on cocaine charges 'set up'
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Two British teenage girls arrested in Ghana for allegedly carrying cocaine worth ?300,000 have claimed they were "set up" to carry the drugs back to England.
Speaking by telephone from prison in Accra, 16-year-old
Yasemin Vatansever told Channel 4 News they were tricked into carrying drugs back to London.
She claimed: "There were
basically two boys over here who gave us two bags, and
told us to bring it (that)
it was an empty bag. "She continued: "The two boys gave us bags in Ghana to bring to London, to give to
the boy in London."
"It was
basically like a set up.
They didn't tell us nothing, we didn't think nothing, cos basically we are innocent"."We don't know nothing about
this drugs and
stuff,
we don't know nothing."