THE ORIGINS OF PROBABLE CAUSE AND THE HISTORY OF CASE LAW IN THIS AREA ARE FIRST DISCUSSED, AND THEN THE VARIOUS ELEMENTS OF PROBABLE CAUSE ARE THEN DRAMATIZED TO GIVE THE PATROLMAN A 'STREET FEEL' OF HOW THESE LAWS APPLY TO HIS JOB. THE SPECIFIC TOPICS DISCUSSED INCLUDE THE DEFINITION OF PROBABLE CAUSE, THE PRO'S AND CON'S OF 'LYING A LITTLE' IN COURT TO ESTABLISH PROBABLE CAUSE, THE 'OFFICIAL SOURCES' WHICH CAN ESTABLISH PROBABLE CAUSE FOR A POLICE OFFICER, THE USE OF INFORMANTS TO ESTABLISH PROBABLE CAUSE, AND PROBABLE CAUSE TO SEARCH WITHOUT A WARRANT.