State v. Paszek
In State v. Paszek, 50 Wis. 2d 619, 624, 184 N.W.2d 836 (1971), probable cause to arrest was described as being "that quantum of evidence which would lead a reasonable police officer to believe that the defendant probably committed a crime."
Further, the supreme court stated that "it is not necessary that the evidence giving rise to such probable cause be sufficient to prove guilt beyond a reasonable doubt, nor must it be sufficient to prove that guilt is more probable than not. It is only necessary that the information lead a reasonable officer to believe that guilt is more than a possibility" and that "the quantum of information which constitutes probable cause to arrest must be measured by the facts of the particular case." Id. at 625.