This study is looking at cases of "spiking" in Ghent. Spiking means when someone secretly puts drugs or alcohol into another person's drink or food, or uses a needle to inject them with substances. The study collects information from patients who suspect they've been spiked. It involves a questionnaire about symptoms and recent substance use, and the collection of blood and urine samples to test for drugs. Tests include immunoassay (IA), which checks for the presence of substances, and LC-GCMS, a detailed test for specific chemicals.

**Key Points**:

• The study is for anyone over 18 who thinks they've been spiked, or if others suspect it.
• Participation includes answering questions and giving blood/urine samples, if within 4 days of the event.
• Results can be added to your medical record if you wish.

**Eligibility**: You can't join if it's been more than 5 days since the event, if you can't complete the questionnaire, or if there's suspicion of sexual assault (other support is provided). You must agree to the consent form and sample collection.