Tony Rezko lawyer Joseph Duffy repeatedly called prosecution witness Stuart Levine a liar, saying he caught Levine in lies right on the stand.
"He lies so much, I don't think he knows when he's lying," Duffy said. "It's that bad."
Levine admitted to 30 years of drug use, including some heavy-duty drugs, such as Crystal Meth, Special K and cocaine.
Duffy claimed Levine tried to downplay his drug use, saying he spent just $2,000 a month on drugs.
Duffy showed a chart indicating Levine withdrew $1.3 million in cash from 2000 to early 2004. Duffy attributed the cash to a far more excessive drug use than what Levine admitted.
He then showed a chart showing Levine dialed his drug sources 806 times in a 25-month period.
"That's more than one call a day," Duffy said.
On Tuesday, Duffy's will continue his closing argument. Then prosecutor Chris Niewoehner will deliver the government's rebuttal.