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According to the paper, Gregg told the judge that he got the milk from a food pantry. He said that he entered a guilty plea only so that he could stop languishing in the Oklahoma County Jail, which has been plagued with issues ranging from overcrowding to chronic mold and an unusually high suicide rate for decades.

On Friday, the case was dismissed and Gregg was released.

The Oklahoma City Police Department couldn’t immediately be reached late Tuesday night to clarify how powdered milk was mistaken for a stash of illegal drugs. In the probable cause affidavit obtained by the Oklahoman, an officer wrote that the baggie contained “a large amount of white powder substance that I believed to be cocaine based on my training and experience,” and that the powder “later tested positive for cocaine and was a total package weight of 45.91 grams of cocaine.”

It’s not the first time that a harmless household staple has been incorrectly categorized as an illicit drug. In 2016, the New York Times magazine and ProPublica revealed that tens of thousands of people nationwide were being jailed each year based on the results of finicky roadside drug tests that frequently produced false positives. Often, the tests were responding by environmental factors like the weather, or the presence of chemicals found in household cleaners. In some instances, police simply didn’t understand how to use them correctly.

As The Washington Post reported wrote last year, the list of innocent items that have been misidentified as dangerous drugs includes chocolate chip cookies, breath mints and the glaze from a Krispy Kreme doughnut. Despite growing awareness that the tests have a high error rate – some studies have found that they result in false positives a fifth or even a third of the time – many police departments continue to rely on them.