5. What constitutional question did the use of this technology raise?

The fourth amendment:

The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.

The amendment prohibits the government from conducting unreasonable "searches" and "seizures." The exclusionary rule enforces the amendment by prohibiting federal, state, or local judges from admitting in the government's case-in-chief evidence obtained in violation of the Fourth Amendment. Parties injured by an unlawful search or seizure can also bring a damages action against the officers involved, but the exclusionary rule has made criminal trials the most likely forum for a public airing of competing versions of what the Fourth Amendment should protect.