One requirement of the U Visa is that you must have suffered substantial physical or mental abuse because you were a victim of a qualifying criminal activity. You should note that the abuse you suffered does not have to be physical, but can also be mental and emotional.
According to 8 CFR § 214.14 (b)(1), USCIS will consider the following factors in determining whether the abuse was substantial:
The U Visa is a visa for victims of crimes. Law enforcement, prosecutors, judges or government officials can certify a U Visa based on past, present, or future likelihood of the victim being “helpful” in the examination of the criminal activity that the victim witnessed.
One of the requirements of a U visa is that the victim must submit a U visa certification that was completed and signed by an appropriate law enforcement officer or authorized public official. The victim has to submit Form I-918 Supplement B, U Nonimmigrant Status Certification.
For a victim to qualify for the U Visa Status, the immigrant must have been the victim of a qualifying criminal activity. The regulations define the U Visa status victim as “an alien who is directly and proximately harmed by the qualifying criminal activity.”
The U visa is a nonimmigrant option available to non-citizens that have been victims of serious crimes. The policy of this visa is to help law enforcement agencies investigate and prosecute criminals and protect victims of such crimes.