> Aren't "millimetre wave weapons" used for crowd control by some US police departments?

The capital military police and the border patrol have both inquired about using these millimeter wave weapons. Both were rejected [1]. The weapons were considered but also rejected for use in Iraq and Afghanistan [2].

In 2010, a prison made news by installing such a weapon, a move opposed by the ACLU [3]. It is unclear if it was ever used.

[1] https://www.npr.org/2020/09/16/913748800/military-police-lea...

[2] https://news.yahoo.com/the-secret-troubled-history-of-the-mi...

[3] https://www.aclu.org/news/national-security/dont-let-militar...