A civil lawsuit alleging sexual assault at a Cornell University fraternity house has drawn international attention and prompted a renewed criminal investigation. It has also raised questions about drug-facilitated sexual assault.
Understanding how these substances affect awareness and memory can help explain the challenges in investigating suspected drug-facilitated sexual assault. Medical care and support are available even when someone is unsure what happened. This article outlines the allegations and investigation, explains the effects of substances that may be involved, and describes how to seek medical care and support if you think you or someone you know has been harmed.
The Cornell Case: Timeline of the Allegations and Investigation
On September 16, 2026, a former Cornell University student filed a civil lawsuit against seven members of the Chi Phi fraternity. The lawsuit alleges that the members sexually assaulted her at the fraternity house in October 2024, after she had been drinking alcohol and was pressured into taking ketamine. [18]
The lawsuit also claims the university knew, or should have known, that the chapter had a drug culture centered on ketamine, and failed to protect her or appropriately punish those involved. [18]
She reported the incident to Cornell University police in November 2024. According to CBS News, police interviewed her on November 14 and 15, more than three weeks after the alleged assault. [22]
By then, alcohol and ketamine would very likely no longer be detectable in her blood or urine. Even sensitive urine tests generally detect alcohol for only a few days, and ketamine’s breakdown products for up to about two weeks. [1] [2] A negative toxicology result would therefore not rule out drug exposure or sexual assault.
Local prosecutors declined to bring charges in 2024. [18] Tompkins County District Attorney, Matthew Van Houten, has said the sworn statement provided to his office in 2024 differed from the later civil allegations. The woman’s lawyer has challenged how prosecutors handled the original investigation, and questions remain about which records they received. In September 2026, Van Houten announced that the criminal investigation would reopen after the civil lawsuit was filed. [18]
On October 1, 2026, Governor Kathy Hochul appointed New York Attorney General Letitia James as special prosecutor in charge of the criminal investigation. Hochul cited “serious questions” about the original investigation by Cornell University police and the district attorney’s office. James will investigate the allegations and, if warranted, pursue criminal charges and present evidence to a grand jury. [20] [21]
Cornell said its own investigation led to some students being disciplined or expelled, and the Chi Phi chapter being barred from campus. Cornell has appointed former Deputy U.S. Attorney General Sally Yates and law firm King & Spalding to review how the university prevents and responds to sexual misconduct. The review will examine how the university handled the October 2024 allegations. [19]
How Ketamine, Alcohol, Rohypnol, and GHB are linked to sexual assault
Drug-facilitated sexual assault (DFSA) can involve spiking someone’s drink, pressuring them to take a substance, or taking advantage of their intoxication to engage in sexual activity without consent. It also includes assaults after someone has chosen to drink or take drugs. That choice does not mean they have agreed to sexual activity.
Consent is a freely made agreement that can be withdrawn at any time. Agreeing to one sexual act, or to sex with one person, does not mean agreeing to anything else. Being silent or not fighting back does not amount to consent.
The allegations raise questions about intoxication, consent, and institutional response to reports of sexual assault.
Below are examples of substances that can be involved in drug-facilitated sexual assault.
Ketamine
Ketamine is a dissociative anesthetic used in medical care. Dissociation can produce a sense of detachment from the body and surroundings. Ketamine is also prescribed off-label for depression, alongside other mental health conditions, and used recreationally outside medical settings. Its effects can include confusion, impaired coordination, and difficulty forming new memories. At higher doses, some people experience profound dissociation, informally known as a ‘K-hole’, which can make movement and communication difficult. [5]
These effects may make it difficult to seek help or remember what happened. A perpetrator may administer ketamine without someone’s knowledge, pressure them to take it, or exploit its effects after they have taken it voluntarily. [6]
The duration of ketamine’s effects on a person varies depending on the dose, how it is taken, and whether other substances are involved. Coordination, judgment, and awareness may remain impaired after the strongest effects have passed. [6] This lingering impairment is why ketamine is used by offenders to facilitate sexual assault; someone affected may be unable to resist, call for help, or recall events clearly.
Alcohol
Alcohol is the substance most often involved in sexual assault, both on college campuses and in wider society. [3] Alcohol can impair judgment, coordination, and memory. A perpetrator may exploit another person’s intoxication. Drinking does not make the person assaulted responsible or excuse the perpetrator’s actions. [4]
An alcohol blackout means someone cannot remember part or all of what happened while drinking. During an alcohol blackout, someone may remain awake, talking, and interacting with others at the time. Passing out is different; the person loses consciousness.
Alcohol can also make it harder to communicate or ask for help.
Rohypnol and Other Benzodiazepines
Rohypnol, the brand name for flunitrazepam, is a powerful sedative in the benzodiazepine family. It is not approved for medical use in the US, but some other countries prescribe it for severe insomnia. Rohypnol is often associated with the term “date rape drug." [7]
Rohypnol can cause severe drowsiness, muscle weakness, confusion, and difficulty forming new memories. Perpetrators may exploit these impairments to facilitate sexual assault. [7]
Prescription benzodiazepines such as Xanax (Alprazolam) and Klonopin (Clonazepam) can also cause sedation and memory impairment, and can be misused by perpetrators to facilitate sexual assault. [8]
GHB
GHB (gamma-hydroxybutyrate) is a central nervous system depressant. It can cause drowsiness, confusion, vomiting, memory impairment, and loss of consciousness. Effects depend on the dose and other substances taken, and combining it with alcohol increases the risk of serious harm. [9]
GHB has a narrow margin between a dose that causes euphoria and one that causes unconsciousness, especially when it is combined with alcohol. It can leave a person unable to move or call for help, and often with little or no memory of what happened. These effects are why it has been linked to drug-facilitated sexual assault [9]
Why Mixing Substances Is So Dangerous
Drug-facilitated assaults can sometimes involve mixing substances. Alcohol and other drugs may be involved together. Combining depressant substances can increase sedation and the risk of serious harm, including breathing difficulties. [10] Ketamine adds to the sedation and memory loss caused by alcohol, which makes it harder for people to recall what happened to them while under the influence.
If you are with someone who has taken substances and cannot be woken, is not breathing normally, or has blue-tinged or purple lips, call 911 and stay with them until help arrives. Follow the emergency dispatcher’s instructions. Learn more about what to do in the event of an overdose.
Signs you may have been drugged, and what to do
The effects of drugs used in sexual assault can be hard to discern from heavy drinking, especially if you have already drunk alcohol. Possible signs include the following, but these symptoms cannot confirm that someone was drugged or assaulted. Similar symptoms can occur with alcohol, other substances, or medical conditions: [11]
- Feeling far more intoxicated than the amount you drank would explain
- Sudden, extreme drowsiness, dizziness, or confusion
- Trouble speaking, moving, or controlling your body
- Nausea or vomiting
- Waking up with little or no memory of the night, or in an unfamiliar place
- Unexplained injuries or soreness, or signs of sexual activity you don't remember
You don't need visible injuries, full memory, or certainty about what happened to seek care.
If you think you were drugged and assaulted, the U.S. Drug Enforcement Administration (DEA) advises taking these steps: [12]
- Get to a safe place and ask someone you trust to stay with you.
- Call 911 if you or someone else is in danger, or if a friend is hard to wake or struggling to breathe.
- Seek medical care as soon as possible. Tell the clinician that you suspect drug-facilitated sexual assault and ask about what medical care, evidence collection and testing are available. Routine hospital drug screens may miss relevant substances, and forensic samples may need to be collected separately.
- Keep anything that could help as evidence. If you can, wait until after an examination to wash or change clothes. Save clothing, messages or anything else that might help show what happened. Your safety and medical needs come first. If you have already washed, changed clothes, or used the toilet, you can still seek care and an examination.
- Contact the police and tell them everything, including any drinking or drug use. Nothing you did justifies sexual assault.
- Call a sexual assault crisis center, such as RAINN (800-656-4673), for support and information.
If you choose not to report to the police, a sexual assault advocate can explain the process and support you. You can seek medical care and support without deciding whether to report first.
Detection windows and testing
If you think you have been drugged, get medical help as soon as you can and explain what you are worried about. Some substances can be difficult to detect after just a few hours, and routine drug screens may miss them.
The longer it takes to collect samples, the harder it may be to detect a substance. Testing is only one part of an investigation: a negative result does not mean you were not drugged or sexually assaulted.
| Substance | Approximate urine detection window |
|---|---|
| Alcohol | Up to approximately 80 hours when testing for alcohol metabolites EtG/EtS) [2] [13] |
| Ketamine | Approximately 2 days; metabolites, or substances produced as the body processes the drug, may be detectable for up to approximately 2 weeks with sensitive lab tests [1] |
| GHB | Up to approximately 12 hours; it may become undetectable sooner [14] |
| Rohypnol | Approximately 1–5 days; breakdown products up to 2–4 weeks with specialized lab tests [15] |
These windows vary with the amount taken, a person's metabolism, and test sensitivity. A negative result does not rule out drug exposure or sexual assault. A positive result alone cannot establish how a substance was taken or whether sexual activity was consensual.
Drugs, Alcohol, and Sexual Assault on Campus
The Cornell case has renewed attention on sexual assault at US colleges, where heavy drinking and party drug use are common, and fraternity parties often bring both together. In Cornell’s 2025 survey, approximately 35% of undergraduate women who responded reported nonconsensual sexual contact involving physical force or incapacitation since entering Cornell, up from 23% in 2023. [16] [17]
Colleges should teach students about consent, take reports of sexual assault seriously, and make it clear where to find support. If someone seems very intoxicated or unsafe, people nearby can help them get to a safe place or seek medical care.
Where To Find Support
If you or someone you know has been affected by sexual assault or drug-facilitated assault, help is available. You don't have to decide right away whether to report to police in order to access support:
- Emergency: call 911 if anyone is in immediate danger or needs urgent medical care.
- RAINN National Sexual Assault Hotline: call 800-656-4673 or chat at online.rainn.org. It's free, available 24/7, and can connect you with local services and trained sexual assault nurse examiners.
- 988 Suicide & Crisis Lifeline: call or text 988 if you're struggling to cope.
- SAMHSA National Helpline: call 1-800-662-4357 for free referrals to substance use and mental health treatment.
- Campus resources: Campus counseling and advocacy services may offer confidential support. A Title IX office can explain institutional reporting options. Ask each service about confidentiality and any reporting obligations.
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