SACRAMENTO, Calif. — Within some seedy enclaves of Northern California, Brian Nehring is known as a master of disguise for the Drug Enforcement Administration with the uncanny ability to convince seasoned and suspicious drug dealers that he’s not a cop.

But this sly government chameleon may now be trapped by his own apparent sweet tooth. The lawyer for one of three Aryan Brotherhood members facing racketeering charges believes he may have caught Nehring lying under oath to cover up the eating of two doughnuts in 2019.

Before a grand jury five years ago, Nehring, a DEA special agent, testified he ate doughnuts from an Irish Mafia-connected heroin dealer who’d concealed drugs in the box. Yet just the other day, before a jury in a RICO case, Nehring denied he ate them. Called back to the stand for a third time last Monday, Nehring hedged his denial.

“I don’t think I did. Although it wouldn’t surprise me,” Nehring said. “I love doughnuts.”

Now, defense attorney Knut Johnson wants to bring Nehring back on the witness stand — again — and impeach him with the grand jury transcript where he confesses to the doughnut eating. And lest anyone think this issue is a “silly” legal point, Johnson’s motion offers assurances that it is in fact, deadly serious.

“(Nehring) is unreliable, the jurors should not trust him, the police investigation is sloppy, and the case agent in charge of the government’s case does not seem to care about details,” Johnson wrote, adding that it showed an “unserious, unprofessional approach,” besides being potentially dangerous.

On Wednesday afternoon, Chief U.S. District Judge Kimberly Mueller granted Johnson’s motion.

Johnson’s client, William Sylvester, is charged with butchering an inmate named Ronald Richardson in an attack caught on camera, a fairly straightforward allegation with only one real legal question: prosecutors say Sylvester did it to obey a standing order by the Aryan Brotherhood to attack skinhead gang members, while the defense says Richardson was a “known child molester” and not welcome on that exercise yard.

In order to prove a racketeering murder, prosecutors must establish a gang-motive for the Richardson murder. Authorities have also implicated Sylvester in assisting co-defendant Ronald Dean Yandell in directing heroin sales inside and outside of prison.

Here’s how the donuts play into the biggest effort in decades by the federal government to splinter the Aryan Brotherhood prison gang: In the late 2010s, Nehring started investigating some alleged heroin dealers associated with the Contra-Costa Family Affiliated Irish Mafia, which led to his discovery that one of his suspects was spending a lot of time on the phone with an Aryan Brotherhood commissioner.

Her name was Jeanna Quesenberry, and a DEA wiretap revealed she was helping the Aryan Brotherhood smuggle drugs into prison and sell them on the outside, sometimes with help from members of an Orange County-based skinhead gang, according to prosecutors. She was also selling heroin to Nehring, whose longtime work as an undercover agent has led to infamous drug busts, like the takedown of Thizz Entertainment, a popular Vallejo-based rap label.

Testifying before a 2019 grand jury, Nehring described his interactions with Quesenberry and how one time she gave him a box of doughnuts, with heroin hidden under a false bottom that she crafted.

“Sounds like a lot of work,” offered Assistant U.S. Attorney Jason Hitt, perhaps attempting to elicit more details of Quesenberry’s drug concealment. But Nehring just continued to talk about doughnuts.

Nehring said colleagues teased him about it and told him, “you ate heroin,” but that he didn’t think the drugs touched the chocolatey goodness. “They were good doughnuts,” Nehring said.

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