What Happened

Kristen Carotenuto, 35, a nurse at an outpatient surgical center in Stamford, Connecticut, removed hydromorphone and fentanyl vials from secure storage, extracted the controlled substances with a syringe for personal use, refilled the vials with saline or water, and returned the tampered vials to storage where they could be distributed to patients.

The diversion occurred in December 2024. After the tampering was discovered, investigators found no evidence that any patient received one of the adulterated vials — a fortunate outcome given that a patient administered saline instead of an opioid analgesic in a surgical setting could suffer inadequate pain control or sedation.

Carotenuto pleaded guilty to tampering with a consumer product on August 7, 2025. She was sentenced on August 12, 2025 to five months in prison, three years of supervised release, and a $5,000 fine.

What Went Wrong

A nurse was able to access secure vial storage, adulterate multiple vials of controlled substances, and return them to circulation. Key control failures include:

  • Unsupervised access to controlled substance vials. Carotenuto was able to remove vials from secure storage, manipulate them, and return them without detection — indicating inadequate access controls or insufficient monitoring of withdrawal activity.
  • No tamper inspection at the point of use. Adulterated vials were returned to storage and remained available for patient use. A pre-administration inspection protocol — checking vial integrity, fill volume, and clarity — would have identified the tampered product before it reached a patient.
  • Vial-level accountability gap. In outpatient surgical settings, controlled substance vials should be accounted for from receipt through administration or waste. The ability to withdraw and return vials undetected suggests reconciliation between dispensed and administered quantities was not done at a granular level.
  • No behavioral surveillance flagging diversion patterns. Diversion for personal use often produces recognizable patterns — unusual withdrawal frequency, vials accessed outside of scheduled procedures, or discrepancies between drug withdrawn and drug administered. These patterns were not caught in real time.

How It Could Have Been Prevented

  • Require two-person access for withdrawal of controlled substance vials in outpatient surgical settings, with dual sign-off on each vial removed from secure storage.
  • Train clinical staff to inspect every controlled substance vial for tamper evidence — puncture marks on the septum, altered fill volume, cloudiness, or broken seals — immediately before administration.
  • Reconcile controlled substance vials dispensed against documented administration or witnessed waste on a per-procedure or per-shift basis, investigating any unaccounted quantity before the next procedure begins.
  • Implement automated dispensing cabinet analytics that flag unusual withdrawal patterns — such as withdrawal without a corresponding patient procedure or repeated access by the same individual.
  • Establish a confidential reporting mechanism so that colleagues who observe suspicious behavior can report without fear of retaliation, reducing reliance on formal investigation to surface diversion.
  • Conduct periodic unannounced counts of controlled substance vials in outpatient surgery storage to detect discrepancies before they accumulate.

Related Guidance

  • 15 Red Flags of Drug Diversion — Behavioral and recordkeeping indicators that diversion may be occurring in a clinical setting.
  • Investigation Playbook — Steps to take when tampering with controlled substance products is suspected or confirmed.
  • Policy Templates — Controlled substance handling, access control, and tamper inspection policy templates for outpatient surgical settings.
  • Diversion Trends — Current enforcement trends including vial-tampering cases and anesthesia-area diversion.