Really? Safety? That's the angle they're working?
If there's anything I've learned in life with the many jobs I've had and the situations I've been in, safety is a secondary concern of Americans. When the DHS requests something like this, it should raise some eyebrows. After all, they groped my junk at the airport last I was there. Privacy is of no consequence to them... in the name of "safety".
"Inquiry is fatal to certainty." -- Will Durant