CHICAGO (CBS) — Chicago’s top cop is responding to a juror in the William Balfour trial who said police bungled the investigation into the murder of Jennifer Hudson’s family members.

After helping convict Balfour last week, juror Jacinta Gholston told reporters there were holes in the case and mistakes made in the investigation – factors that made deliberations more difficult.

CBS 2 Chief Correspondent Jay Levine asked Chicago Police Supt. Garry McCarthy about her comments.

“Our life and our world has become more difficult by shows like ‘CSI,’” McCarthy said. “Whenever jurors are interviewed, they expect that we’re going to get fingerprints and DNA off of a gun at every single scene that occurs and that we’re going to do it within 30 minutes and wrap it up.”

McCarthy added: “Peoples’ expectations of how an investigation proceeds have been made unreachable, in some cases.”

Another juror said it was only after the panel got over what they called the “CSI factor” that they were able to reach a unanimous verdict.

McCarthy went on to say it is a defense attorney’s job to try to poke holes in the prosecution’s case, whether they exist or not.

Balfour, 31, was convicted of killing singer Hudson’s mother, brother and 7-year-old nephew in late 2008. Prosecutors said he killed them because he felt jilted by Hudson’s sister Julia, whom he was married to at the time.