Hi and thanks for doing this.

I went through CBP twice in the span of 20 hours. I was granted entry once and denied the second time. The second time, I had to sign some electronic pad and later a form (I-275) was given to me. Did I have the option not to sign? And is this contradictory decision in span of 20 hours legally OK?

Below are some more details:

At Toronto Pearson (Terminal 3) on December 1-2, 2025, I went through CBP twice and the first time I was granted entry and second time denied. I am a dual Canadian-Iranian citizen. On day one I was given a detailed biographical form, questioned repeatedly about my purpose of travel (Conference), employment, etc and especially about any Iranian military service. I provided old passports and a university transcript showing that I have not been in Iran since 2019 and prior to that I was studying in the university. They also explicitly questioned me about a prior incident in which Canadian police claimed an explosive trace ("Tetryl") on me, which I disputed as an error. CBP took my belongings (backpack, watch, wallet, phone), conducted a body inspection in another room (through search, hands inside my pants followed by groin search) took my fingerprints multiple times and took my phone after requiring the pass code and it was out of my possession for about an hour. After several hours they told me I was "negative" but by then my flight had departed. I was given only a piece of paper with CBP stamp. Since there was no flight for my airline for the rest of the day, I was brought back to the Canadian side. The day after, I went through CBP again and when I showed them their paper with stamp I was told "we are not going to take your word for it" and the full process happened again (although no body check or phone check this time). A different officer then stated that my documents were not sufficient to prove I had not done military service in Iran and that I now needed an official exemption letter or something similar from Iranian authorities. He added that I should have been "advised differently" the night before. Finally, my picture was taken and I was asked to sign on a pad twice. Only afterward did they print and hand me a form (I-275) showing a withdrawal of my application. I was escorted back to the Canadian side. Did I have the option not to sign? If in future I decide to visit US is this going to be held against me? I can provide more details or the form if necessary.