What Happened
Melissa Elizabeth Chacona, a nurse at a Raleigh-area surgical practice, tampered with at least 78 vials of painkillers intended for surgical patients over several months, replacing the medication with saline.
Starting in early 2019, Chacona extracted medication from vials of fentanyl, morphine, and meperidine and replaced it with saline. Testing later revealed that compromised vials contained less than 15% of their labeled medication and that the tampering had rendered multiple vials unsterile — a direct infection risk for surgical patients. Chacona had also previously been convicted at the state level for diverting medication earlier in her nursing career.
She pleaded guilty on March 9, 2022, and was sentenced in May 2023 to 48 months in federal prison and three years of supervised release. Her plea required permanent surrender of her nursing license.
What Went Wrong
- A prior diverter was allowed to keep practicing. Chacona had a previous state-level diversion conviction, yet remained employed with access to controlled substances at a surgical practice.
- 78 vials compromised without detection for months. That volume, sustained over an extended period, indicates no potency testing or systematic vial inspection was catching the tampering.
- Unsterile vials reached surgical patients. Beyond the loss of pain control, patients faced an undetected infection risk from tampering that broke vial sterility.
How It Could Have Been Prevented
- Screen for prior diversion convictions or board actions during hiring and credentialing, and apply heightened monitoring for any staff with such history.
- Randomly test returned or in-use vials for potency and sterility to catch saline-substitution schemes before they reach hundreds of doses.
- Require witnessed waste for every controlled substance not fully administered, documented at the time of use.
- Track post-operative pain control effectiveness as a clinical signal — a pattern of patients needing unusual rescue dosing can indicate diluted medication.
Related Guidance
- Investigation Playbook — Screening staff with prior diversion history and monitoring elevated-risk employees.
- 15 Red Flags of Drug Diversion — Clinical and behavioral indicators of vial tampering.
- Policy Templates — Witnessed waste and vial-integrity inspection policy templates.
- Hospital Self-Assessment Checklist — Hospital self-assessment, 8 sections and 63 weighted items.