Then you have an exceptionally poor understanding of the Constitution, and you have absolutely no foresight.
Federal agents have for decades been permitted to issue administrative subpoenas in order to investigate such matters as narcotics trafficking, insider trading, health care fraud, and even violations of the Occupational Health and Safety Act (OSHA). Since the Supreme Court has not ruled these subpoenas unconstitutional, my understanding of the constitution is the same as the Supreme Court. If someday the court rules those subpoenas as unconstitutional too, then I will change my opinion to match yours.
and you have absolutely no foresight.
I foresee terrorism as the biggest threat to our national security for the foreseeable future.