In warrantless arrests, what determines when DNA sampling can occur?

• A. The arresting officer's discretion
• B. The judge's orders
• C. Probable cause determination
• D. The lab's standard procedures

Answer: (C)

DNA sampling in a warrantless arrest is tied to the arrest being supported by probable cause. If there’s a reasonable belief—the probable cause—to think the person committed the crime, the arrest is lawful, and many jurisdictions authorize taking a DNA sample at that moment under applicable statutes. This makes the probable cause determination the factor that sets when sampling can occur. It isn’t up to the arresting officer’s personal discretion, nor is it driven by a judge’s order (that would be a warrant situation), and it isn’t dictated by lab procedures (which govern what happens after the sample is collected).