A police informant bought a packet of cocaine from Gonzalez's husband, Albert Nunez, on their front porch while Officer Robert McDonnell watched, according to the warrant.
But that informant, Ventura Martinez, now says that the search warrant was based on a lie: He never bought drugs from Nunez.
Cujdik is at the center of a joint federal and local investigation that arose after Martinez claimed in a Daily News article that Cujdik told him to lie about some drug buys so that the officer could obtain search warrants to enter homes of suspected drug dealers.
Nunez's case - one of hundreds under scrutiny - could thrust McDonnell into the burgeoning probe.
Cujdik and McDonnell worked together in the Narcotics Field Unit. Cujdik is now on desk duty, his gun and badge taken, police said.
Reached last night, McDonnell politely declined to comment.
In an exclusive interview with the Daily News earlier this month, Martinez - known as Confidential Informant #103 - said that both he and Cujdik were driven in part by financial gain.
The Police Department paid Martinez for drug buys and for tips leading to arrests. Martinez said that he gave at least $20,000 in informant cash to Cujdik for rent on a Kensington house that Martinez and his family leased from Cujdik between September 2005 and Jan. 30 of this year.
Cujdik's attorney, George Bochetto, has said the allegations are untrue and are based on the word of a "professional liar."
Last week, Nunez's attorney, Jeremy Ibrahim, filed a motion aimed at getting Martinez on the witness stand. Ibrahim cited the Daily News articles and said that "a dark cloud has been cast over the law and Constitution."
"Both Mr. McDonnell and Informant #103 are suspect," Ibrahim wrote in his motion. A judge has yet to rule.