VCA Amherst Animal Hospital (Patrick Gries, D.V.M.)
Outcome
Patrick Gries, D.V.M., pleaded guilty in January 2022 to adulteration of a drug and distribution of a controlled substance without prescription after investigators found he had been withdrawing hydromorphone (Dilaudid) from surgical vials at VCA Amherst Animal Hospital and injecting it into himself since the 1990s while substituting diluted or saline-replaced vials for animal surgeries; he was sentenced to 8 months in federal prison.
Details
Patrick Gries, D.V.M. (VCA Amherst Animal Hospital) — Hydromorphone Self-Diversion / 8-Month Prison Sentence (2022)
Outcome: Patrick Gries, D.V.M., was sentenced to 8 months in federal prison in June 2022 after pleading guilty to adulteration of a drug held for sale after shipment in interstate commerce and distribution of a controlled substance without a written prescription — arising from nearly three decades (1994–2021) of withdrawing hydromorphone from surgical vials at VCA Amherst Animal Hospital and injecting himself with the drug while leaving diluted or saline-replaced vials for animal surgical patients.
Patrick Gries, 54, of Madison Heights, Virginia, practiced as a Doctor of Veterinary Medicine at VCA Amherst Animal Hospital in Amherst County, Virginia from approximately 1994 until 2021. As the hospital's primary surgeon, Gries held primary responsibility for, and unrestricted access to, the hospital's supply of Dilaudid (hydromorphone) — a Schedule II opioid used to manage post-surgical pain in animal patients.
Beginning at some point around 1994 and continuing through 2021, Gries systematically withdrew portions of hydromorphone from the hospital's pharmaceutical vials and injected the controlled substance into himself. To conceal the theft, Gries replaced the withdrawn hydromorphone with diluted solution or saline, leaving adulterated vials in the hospital's controlled substance supply. These adulterated vials were subsequently administered to animal surgical patients — who received reduced or absent analgesia without any awareness by the treating staff, owners, or patients that the drugs had been tampered with.
Gries pleaded guilty in January 2022. The court sentenced him to 8 months in federal prison. The case spanned 27 years at a single institution, suggesting that VCA Amherst's controlled substance audit program was insufficient to detect systematic diversion across hundreds or thousands of transactions over nearly three decades.
Primary Source: Amherst County Veterinarian Sentenced for Opioid Theft | DOJ
How Crucible Prevents This
Self-diversion by a surgeon with exclusive access to the controlled substance cabinet is the archetypical case that dual-control protocols are designed to prevent. Crucible's controlled substance gate — requiring a second licensed staff member to co-sign each controlled substance withdrawal — would eliminate the unwitnessed access pathway Gries exploited for nearly 30 years. The adulterated vials he left behind (diluted or saline- replaced) were administered to surgical patients without their consent to reduced analgesia, making the diversion also a patient safety violation. This case involves multiple decades at a single employer, indicating the employer had no meaningful controlled substance verification system.
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