The ACLU's concern is well-founded.  I myself have often been perceived as Hispanic when in the mainland.  That specifically includes Texas.  It's even happened that Spanish speakers have come up to me in an airport, say, or a hospital, and opened a conversation in Spanish (of which I know perhaps fifty words).  This is "not a hypothetical", it definitely happens.  
As a Hawai'ian native-born US citizen, I have no intention of carrying my original, notarized long-form birth certificate around with me.  Certainly not in Texas.  So I've erected a metaphorical wall around it.  New Mexico's got better chili and BBQ anyway.