Many such witnesses, if they must come to the US, can do so on a B visa or under the Visa Waiver Program.
If the witness in question is coming to testify for the prosecution of a serious crime, other options may be available, such as a T or U visa for victims of some serious crimes, an S visa for informants, or “significant public benefit parole” in certain cases.
As described in the Foreign Affairs Manual, an S, T, or U visa could be appropriate depending on the situation (a T or U visa might apply if the witness is a victim of human trafficking or other crimes). Though there are some severe limitations: there are only 200 S visas available per year, plus another 50 for terrorism cases.
Significant Public Benefit Parole could be used in some cases.
An ordinary B-1 (Visitor) visa might apply, such as for giving testimony in civil court in business litigation.
Credit:stackoverflow.com‘
5 Mar, 2024
4 Mar, 2024