I'm very surprised this tech is allowed. The law is very specific on strip searches, which this most certainly is.
No, it isn't.
There's some case law, but it's mostly jail cases, all pre-conviction, so less abrogation of civil rights, but the case law focuses more on the outrageous behavior of the searchers than the concept of strip search in and of itself.
The trouble is that before this lovely technology was handy, no one thought much about randomly strip-searching: Anyone who looks suspicious, anyone with a D-DD cup size, random grannies with metal hips.
As a DD, I find this alarming. But no, there is not much established law on virtual strip searches as a condition of partaking in a pseudo-voluntary* activity.
*See interstate travel.