I make it a point to read a couple of photo sites every day. Today on Fstoppers there was a post - mostly for street photographers - asking: "If you took a picture of someone on the street, and they objected and asked you to delete it, would you?"
In the comments section, there was a comment by someone named Brigham Brown that - IF TRUE - floored me.
"Photographed a border patrol officer at the US/Canada crossing station. He told me if I did not delete it I would be "detained" and arrested after my vehicle was searched and towed off. I would be in Minnesota in a Federal holding facility for at least a week due to "lost paperwork" while my vehicle would be in another State being taken apart for possible hidden compartments holding illegal drugs. Photo gear would be "God knows where" and taken apart. So, I deleted the images and showed him.
Then left, took out the CF card and went home and recovered the photos. Made postcards of it and mailed them to a half dozen border crossing station with "this guy is a jackass" on the back.
You can always delete and then recover the image."
Personally, I wouldn't have made postcards, I would have mailed them to Inspector General of his department, along with a full report of the conversation, and a copy to my - otherwise useless - congresscritter.
(Assuming there weren't signs posted saying NO PHOTOGRAPHY at the border crossing point.)