Depending on the crime, most people would agree that face/gait recognition is warranted, for example in case of murder or rape. The difference here is that some people consider "illegal immigration" to be more like a misdemeanor, others consider it to be something much more serious.
> " others consider " laws are knowable. readable. Opinion on them does NOT matter.
Quick, does the First Amendment allow the government to place any restrictions on speech? The words are right there for the reading and knowing, so that should be a simple question, surely?