Summary

Wiley Blount Rutledge Brinegar v. United States — Opinion of the Court

But the mistakes must be those of reasonable men, acting on facts leading sensibly to their conclusions of probability. The rule of probable cause is a practical, nontechnical conception affording the best compromise that has been found for accommodating these often opposing interests. Requiring more would unduly hamper law enforcement. To allow less would be to leave law-abiding citizens at the mercy of the officers' whim or caprice.
The troublesome line posed by the facts in the Carroll case and this case is one between mere suspicion and probable cause.
Source: Wikisource

Wiley Blount Rutledge Brinegar v. United States — Opinion of the Court

For a variety of reasons elating not only to probative value and trustworthiness, but also to possible prejudicial effect upon a trial jury and the absence of opportunity for cross-examination, the generally accepted rules of evidence throw many exclusionary protections about one who is charged with and standing trial for crime.
Source: Wikisource

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