Stan This is a direct copy, in part, of the DHS statement regarding their 100 mile border search and seizure policy.
The border search exception is a doctrine of United Statescriminal law that allows searches and seizures at international borders and their functional equivalent without a or probable cause.
This doctrine is not actually an exception to the Fourth Amendment, but rather to the Amendment's requirement for a warrant (or probable cause). Balanced against the sovereign's interests at the border are the Fourth Amendment rights of entrants. Not only is the expectation of privacy less at the border than in the interior  the Fourth Amendment balance between the interests of the Government and the privacy right of the individual is also struck much more favorably to the Government at the border. This balance at international borders means that routine searches are "reasonable" there, and therefore do not violate the Fourth Amendment's proscription against "unreasonable searches and seizures".
Border searches more invasive than "routine" require some suspicion. See the section below.
Despite federal law allowing certain federal agents to conduct suspicionless search and seizures within 100 miles of the border, the Supreme Court has clearly and repeatedly confirmed that the border search exception applies only at international borders and their functional equivalent (such as international airports).
Stan, You asked for more details on the 100 mile border areas set up by the DHS. I don't really have much more than I put in my blog; however I do have the capability to research it a little further and will get back to you.
Democrat Sen. Chris Murphy: ‘The Real Second Amendment Isn’t Absolute
Sen. Chris Murphy (D-CT) tweeted Saturday there is a “real” Second Amendment and an “imaginary” one and he believes the real one is “not absolute.”
Murphy, “I support the real 2nd Amendment, not the imaginary 2nd Amendment. And the real 2nd Amendment isn’t absolute.”
The statement was a precursor to his call for banning “assault rifles” in the wake of the Santa Fe High School shooting, even though “assault rifles” were not used in the attack.
Murphy said the “real 2nd Amendment…allows Congress to wake up to reality and ban these assault rifles that are designed for one purpose only – to kill as many people as fast as possible.”
Gov. Greg Abbott (R-TX) said the Santa Fe High School attackers used a .38 revolver and a shotgun to carry out his heinous acts. Therefore, a ban on “assault rifles” would have done nothing to prevent the attack from occurring or the tragic loss of life from taking place.
It should be noted that Saturday was not the first time Sen. Murphy called the essence of the Second Amendment into question. On August 6, 2013, Breitbart News reported that Murphy told MSNBC’s Rachel Maddow that “The Second Amendment is not an absolute right, not a God-given right. It has always had conditions upon it like the First Amendment has.”
Murphy did not grapple with the words, “Shall not be infringed.”