Probable Cause

The government will be able to secure a search warrant from a judge only if the government can show probable cause to believe that the search will reveal evidence of a crime. “Probable cause” exists where “the facts and circumstances within their [the officers’] knowledge and of which they had reasonably trustworthy information [are] sufficient in themselves to warrant a [person] of reasonable caution in the belief” that evidence of a crime would be found in a search.