Final answer:
An adult victim may use a sworn affidavit, obtain a court order, or present medical certification as evidence to prove severe forms of trafficking, usually supported by a cumulative evidence assessment.
Step-by-step explanation:
To prove they fall under a "severe form of trafficking," an adult victim may need to provide various forms of evidence that can include a sworn affidavit, testimony or documentation from credible sources like law enforcement, and sometimes even obtain a court order. In some jurisdictions, a medical certification might be supportive evidence, especially in cases of trafficking that involved physical or psychological harm requiring medical attention. Often, the cumulative assessment of different pieces of evidence is used to establish the severity of the trafficking situation. Proving severe forms of trafficking might also involve cooperation with law enforcement for investigation and prosecution of traffickers.