I have traveled to and from Canada to the US literally hundreds of times and security sucks massively at the borders. The Homeland Security does a decent job as anyone reading the news can tell, but border security rates about the same level as mall cops. 

These are not Mensa members people are dealing with. Many are career border guards and tend to be professional and also tend to be older. The remainder are wannbe police or failed police applicants. The training is abysmal and the turn over is massive. They are treated not much better than local police in Mexico and have the same issues.

Right now, if you are a Moslem, traveling to the US is probably a bad idea. Keep in mind that most of the law enforcement down there couldn't kiss Trump's butt enough so that is the kind of people you will be dealing with. Trump is a symptom of a very sick country. A sick country who lives in fear generated by their own leaders which is supported by their law enforcement.