THE DISCUSSION IS DIRECTED PRIMARLY TO POLICE OFFICERS, WITH A VIEW TO HELPING THEM AVOID SUCH THINGS AS WRONGFUL ARRESTS AND IMPROPER COLLECTION OF EVIDENCE. A SURVEY OF POLICE POWERS IS ARRANGED ALONG THE LINES OF A TYPICAL CRIMINAL INVESTIGATION, COVERING SURVEILLANCE (VISUAL OBSERVATION, EAVESDROPPING, TELEPHONE TAPPING, INTERCEPTION OF LETTERS AND TELEGRAMS, FINANCIAL INVESTIGATION); QUESTIONING; ARREST (ARRESTS UNDER WARRANT AND OTHERWISE, THE NATURE OF ARREST, DETENTION); SEARCH AND SEIZURE (STATUTORY AND COMMON LAW POWERS, COMMON LAW POWER TO ENTER, SEIZURE OF PROPERTY WITHOUT A WARRANT); AND DISPOSAL OF PROPERTY. THE AUTHORITY OF THE POLICE TO ISSUE LICENSES, PERMITS, AND CERTIFICATES IS ALSO REVIEWED. A SUMMARY OF LEGISLATION RELEVANT TO POLICE POWER TOUCHES ON THE STATUTORY POWERS OF ARREST, SEARCH, AND SEIZURE; STATUTORY POWERS ENABLING POLICE TO ISSUE CERTAIN FORMS OF AUTHORIZATION OR TO OBTAIN INFORMATION; ANTITERRORISM LEGISLATION; AND LEGISLATION ON DOMESTIC VIOLENCE. TABLES OF CASES AND STATUTES AND AN INDEX ARE INCLUDED. (LKM)