A federal judge questioned the foundation of the government’s case Tuesday against Miami criminal defense attorney Ben Kuehne.

Kuehne is charged with money laundering and wire fraud after he vetted $5.2 million in legal fees paid by Colombian drug kingpin Fabio Ochoa to retain prominent Miami criminal defense attorney Roy Black. Kuehne wrote a report concluding the fees were legitimate funds and not cocaine profits from Ochoa’s role as a leader of the infamous Medellin cartel.