Providing that the visitor has not broken any immigrations or border protection laws, is a law abiding citizen/visitor and not acted in an unlawful manner, does an immigrations officer have the right to cancel this traveler's visa?

Providing that the visitor has not broken any immigrations or border protection laws, is a law abiding citizen/visitor and not acted in an unlawful manner, does an immigrations officer have the right to cancel this visitor's visa?

There are many reasons immigration officers can keep you out especially when you hold B1/B2. If they find previous record that you've worked without authorization, or stayed up to 4-5 months and returned within 2-3 weeks, etc.

They have the rights to cancel your visa.. Yes.

Thank you kindly, you have confirmed to me that for an officer to take such a decision, he would have a good reason to do so and would not cancel just because he is in a bad mood. i.e.. There should be some grounds for suspicion that the visitor is unlawful.

Thank you for your time today. Have a great day.

When they cancel someone's visa.. there must be enough reasons/evidence to do so.. not just bad mood.