To qualify for a U-Visa, you have to show that you helped law enforcement. The document that will confirm your help is a government-issued form stating that you helped them. It is Form I-918 Supplement B.
If you contacted the police, you would ask the same department to sign this form for you. Firstly, you should ask for the name and contact information for the person who signs the Form I-918 Supplement B or address your letter to the Chief of Police. If against the person who hurt you, the police filed charges in court, the prosecutor might have gotten involved in the case. If the person who hurt you was ultimately convicted in court, you could also try asking the prosecutor to sign this form.
You fill out only Part 1 of this form and the police and/or prosecutor will fill out the rest.
When sending the form to the police department, you should enclose a cover letter, as well. This letter should include details and descriptions of the crime you suffered. It will help the police fill out the rest of the Form I-918.
After you sent the envelope containing the cover letter and the Supplement B form, you will wait to receive back the signed form from the police department or prosecutor, which sometimes can take several weeks or months. It is important to know that this form is only valid for six months.
Once you receive it, ask for a bond hearing. The signed Supp-B doesn’t mean you will certainly get a U-Visa, but it is a significant first step.