Thanks. I think that's enough to see where you're going. It's on me to find better evidence, so I looked and it looks like a 2020 NIST report suggests masks increase the failure rate in 89 tested algorithms from 0.3% to 5-50%.
That failure rate is enough to give plausible deniability and reasonable doubt in a court, I'd wager. But I'm sure ICE sees a higher failure rate a feature since it likely gives them more pretexts to arrest. At least we know the technology isn't reliable enough to support it.