There have been some proposed laws in the United States that would require the disclosure of algorithmic tools or automated decision-making, and I think facial recognition technology would be included in that.
Some laws that we have seen enacted at the city or state level require transparency for government use. For example, if law enforcement is adopting new technology like facial recognition, that transparency is mandated so that there can be democratic community oversight. In many cases, city councils didn't know what their police departments were using and what technology they had. These laws would mandate that it be made public, and then the city councils and other democratic bodies could exercise oversight.
I've seen it in the government use context.