PROBABLE CAUSE, OR FACTS OR APPARENT FACTS LEADING A REASONABLE MAN TO BELIEVE SOMEONE HAS COMMITTED A CRIME, IS DISCUSSED AS ESSENTIAL TO THE PROPER EXERCISE OF POLICE POWER. DISCUSSION OF INVESTIGATIVE TECHNIQUES COVERS INSPECTIONS, INFORMATION, INTERROGATION, INVESTIGATION, CONFESSION, THE MIRANDA RULE, AND THE STOPPING AND SEARCHING OF CITIZENS BY POLICE. USE OF INFORMANTS AND EQUIPMENT SUCH AS LIE DETECTORS ARE ALSO COVERED. SECTIONS ON ARREST, SEARCH, AND SEIZURE COVER POLICE ARREST POWERS, SEARCH WARRANTS, AND REGULATIONS SURROUNDING THEIR USE. DISCUSSION OF SUPPRESSION HEARINGS COVERS THE EXCLUSIONARY RULE, FOURTH AND FIFTH AMENDMENT SUPPRESSION HEARINGS, AND THE POLICE OFFICER WITNESS. CASES INVOLVING THE FOURTH, FIFTH, AND SIXTH AMENDMENTS ARE CITED AND THEIR RULINGS ARE DISCUSSED. FOURTH AMENDMENT CASES INCLUDE THE FOLLOWING ISSUES: RIGHT TO PRIVACY; SEARCH AND SEIZURE AND SEARCHES UNDER VARIOUS CIRCUMSTANCES WITH OR WITHOUT A WARRANT; USE OF INFORMANTS AND UNDERCOVER AGENTS; POLICE COMMANDS AND EMERGENCIES; SCOPE OF A SEARCH DURING AN ARREST; TRAFFIC MATTERS SUCH AS STOPPING CARS AT RANDOM; AND ELECTRONIC SURVEILLANCE. FIFTH AMENDMENT CASES TOPICS INCLUDE: CUSTODIAL POLICE INTERROGATION, INCOMPLETE MIRANDA WARNINGS, USE OF IMMUNIZED TESTIMONY, AND INTERROGATION OF JUVENILES. SIXTH AMENDMENT TOPICS COVER RIGHT TO COUNSEL, PHOTOGRAPHIC IDENTIFICATION, AND INTERLOCKING CONFESSIONS. OTHER CASES DISCUSSED COVER CIVIL LIABILITY OF POLICE OFFICERS AND ENTRAPMENT. A GLOSSARY, AN INDEX, AND A TABLE OF CASES ARE PROVIDED. A DISCUSSION OF SUPREME COURT DECISIONS AND RELEVANT FEDERAL RULES OF CRIMINAL PROCEDURE ARE APPENDED, ALONG WITH GENERAL LEGAL AXIOMS REGARDING POLICE USE OF FORCE.