> He can deny you entry virtually at will. CBP officer is god at the border. Do you know what the actual laws/regulations are for this stuff? My understanding

> He can deny you entry virtually at will. CBP officer is god at the border. Do you know what the actual laws/regulations are for this stuff? My understanding is that there are in fact valid and invalid reasons for denying entry to a valid visa holder, but that the valid reasons are in practice broad and subjective enough that a CBP officer could nearly always justify their decision (something like "I wasn't convinced they would abide by the terms of their visa").