Due to lack of proper controls in Jeni’s Splendid Ice Creams’ production kitchen and failures of employees to understand basic sanitation, listeria contamination had emerged last month. Inspectors from the Federal Drug Administration said Jeni’s director of operations and regulatory manager showed a lack of competency.

There was no environmental-testing program, and sanitation protocols didn’t exist for evening-shift employees. Also, sanitizer was not used in towels to get rid of food-contact surfaces and no sanitization was used on the floor. Employees were also allowed to work in the garden without using any strategy to avoid contamination after they return to work.

Ahmed Yousef, an Ohio State University professor of food science and a food-safety expert, said the conditions found by inspectors are really concerning. “In general, people look at the dairy industry as probably the most strict as far as safety goes. You enter modern dairy factories, you become really impressed by the cleanliness. In general, people look at the dairy industry as probably the most strict as far as safety goes. You enter modern dairy factories, you become really impressed by the cleanliness”.

The report was released by the FDA on Thursday morning. A recall for all products was issued by Jeni on April 23. It was a day after confirmation came from the FDA that a listeria was present in a pint of Jeni’s Dark Chocolate ice cream bought at a Whole Foods in Lincoln, Neb.

John Lowe, Jeni’s chief executive, said they have addressed all the concerns raised by the FDA over listeria contamination. Lowe said that outside experts were called for help to determine what other areas need improvement to create a world-class, safe environment for making their ice-creams.

Yousef said the most fundamental lesson is to have basic understanding of sanitation.