Toxicological analysis results released in July 2026 confirm that singer İlyas Yalçıntaş tested positive for THC following a high-profile narcotics investigation by the Bakırköy Chief Public Prosecutor’s Office. Meanwhile, fellow singer Sıla Gençoğlu’s test returned a negative result, as authorities published findings for multiple detained figures.
The latest forensic findings from an ongoing sweep targeting high-profile figures in İstanbul have brought clarity to a series of high-stakes detentions. Led by the Bakırköy Chief Public Prosecutor’s Office, the sweeping probe resulted in biological samples being sent to the Forensic Medicine Institution for rigorous toxicological screening according to reporting on the investigation. The Bakırköy Cumhuriyet Başsavcılığı 25 şüpheli hakkında gözaltı kararı vermişti. This expansive operation led law enforcement to detain individuals including İlyas Yalçıntaş, Mehmet Fatih Aksoy, Ateş İnce, Öner Faruk Işık, Şefik Ömer Dolman, Aybüke Albere, Ayşe Nur Balcı, İrem Haznedar, Orhan Yıldız, Eylem İpek Şafak, Gökhan Şafak, Sıla Gençoğlu, Buğra Balkaya, Hilal Zeynep Hedbe, Volkan Büyükhanlı, Burak Çelik, Büşra Tatar, Feyza Cihan, and Asude Mercan at Sarıyer Hamidiye Etfal Eğitim. The resulting reports have dismantled initial suspect defenses while verifying clean bills of health for several prominent individuals who had faced detention and subsequent release.
İlyas Yalçıntaş Test Results and the Collapse of the Herbal Defense
For singer İlyas Yalçıntaş, the newly returned laboratory analysis directly contradicted the explanations he offered during questioning as detailed in investigative updates. During initial house searches, law enforcement recovered a precision scale and jars containing plant material. Yalçıntaş had claimed the scale was spor diyeti için kullanıyorum and asserted that the jars contained kekik sent from his family’s village.

Subsequent laboratory testing decisively refuted those claims. Comprehensive analysis of the singer’s biological samples revealed explicit physical evidence.
According to the Forensic Analysis Report via Haberler, THC (the active ingredient in cannabis) was detected in his blood, urine, and hair samples.
Following the positive toxicology report, a sulh ceza hakimliği ordered the formal arrest of İlyas Yalçıntaş, Ayşe Nur Balcı, Orhan Yıldız, and Şefik Ömer Dolman under charges related to uyuşturucu veya uyarıcı madde imal ve ticareti, while Öner Faruk Işık was released under adli kontrol şartıyla. Gözaltına alınan 11 kişi ise adli kontrol şartı ile serbest bırakıldı.
Contrasting Toxicology Outcomes Across the Detained Group
While Yalçıntaş and several others faced formal charges following positive screens, other well-known figures learned they were cleared of illicit substance use. Soruşturma kapsamında gözaltına alındıktan sonra salıverilen isimler arasında yer alan şarkıcı Sıla Gençoğlu’nun testi negatif çıktı, ve toksikolojik analiz sonuçlarına göre şarkıcı Sıla Gençoğlu’nun uyuşturucu testinin ise temiz olduğu bildirildi. As journalist Burak Doğan’s reporting noted, Sıla’s biological sample analysis confirmed that her test showed no trace of stimulants or narcotics, though separate reporting indicated that her samples also revealed Bromazepam, a prescription-grade benzodiazepine active ingredient known for sedative, kaygı giderici, and kas gevşetici properties.

Other public figures caught up in the sweeping investigation experienced mixed results upon laboratory analysis. Soruşturma kapsamında tutuklu bulunan Ayşenur Balcı’nın da toksikolojik inceleme sonuçları ortaya çıktı; Balcı’nın idrar ve saç örneklerinde kokain tespit edildi. Asude Mercan’ın kan, idrar ve saç örneklerinde kokain tespit edildiği öğrenilirken, Öte yandan Akın Altan’ın kanında, idrarında ve saçında kokain metabolitleri tespit edildi. Ek olarak, Aybüke Albere’nin uyuşturucu testinin temiz çıktığı, Buğra Balkaya’nın kanında ve idrarında THC (tetrahidrokannabinol/esrar etken maddesi) tespit edildiği, ve Cenk Çöteli, Emre Avar, ve Hilal Zeynep Hedbe’nin de testlerinde maddelere rastlandığı bildirildi.
Judicial Status and the Positive Test Reports
Adli Tıp Kurumu tarafından alınan örneklerin sonuçları çıktı ve Yalçıntaş’ın yanı sıra Ayşe Nur Balcı, Asude Mercan, Akın Altan, Buğra Balkaya, Büşra Tatar, Cenk Çöteli, Emre Avar, Hilal Zeynep Hedbe, Orhan Yıldız ve Şefik Ömer Dolman’ın uyuşturucu testinde maddeler tespit edildi. Bu bağlamda, Adli Tıp Kurumu’nda örnekleri alınan isimlerin test sonuçları dosyaya girdi.

| Name | Substance Indicated in Forensic Report |
|---|---|
| İlyas Yalçıntaş | THC (Cannabis) in blood, urine, and hair |
| Ayşenur Balcı | Cocaine in urine and hair |
| Asude Mercan | Cocaine in blood, urine, and hair |
| Şefik Ömer Dolman | Uyuşturucu maddeler tespit edildi |
| Buğra Balkaya | THC in blood and urine |
Additional suspects including Akın Altan, Büşra Tatar, Cenk Çöteli, Emre Avar, Hilal Zeynep Hedbe, and Orhan Yıldız also registered positive toxicological indicators according to the detailed analytics released by authorities. As the legal proceedings move forward, the physical evidence supplied by the Forensic Medicine Institution remains the central baseline for the Bakırköy Cumhuriyet Başsavcılığı as prosecutors evaluate further steps in the ongoing probe.
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