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Press Release

Carroll County Nurse Pleads Guilty to Stealing Controlled Substances from Life Care Center Employer

For Immediate Release
U.S. Attorney's Office, Northern District of Iowa

A nurse, who stole controlled substances from a life care center where she was employed, pled guilty today in federal court in Sioux City.

Cassandra Lynne Vonnahme, age 32, from Arcadia, Iowa, entered a guilty plea to one count of acquiring a controlled substance by means of misrepresentation, fraud, deception, and subterfuge, and one count of false statements relating to health care matters.  Vonnahme had been scheduled to begin a jury trial on December 11, 2023. 

At the plea hearing, Vonnahme admitted that between November 2020 and December 2020, she diverted controlled substances and falsified related documents.  The controlled substances Vonnahme stole and the records she falsified pertained to actual patients.  Vonnahme was later convicted of burglary in Carroll County in 2021, where she stole controlled substances from a stranger’s home.     

Sentencing before United States District Court Chief Judge Leonard T. Strand will be set after a presentence report is prepared.  Vonnahme remains free on bond pending sentencing.  Vonnahme faces a possible maximum sentence of 9 years’ imprisonment, a $250,000 fine, and 4- years of supervised release following any imprisonment.

The case is being investigated by the Iowa Department of Inspections & Appeals, Medicaid Fraud Control Unit and is being prosecuted by Assistant United States Attorney Ron Timmons. 

Court file information at

The case file number is 23-4019.

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Updated December 1, 2023

Prescription Drugs