EXISTING PRACTICES ARE DESCRIBED AND REFORMS SUGGESTED RELATIVE TO THE CONDUCT OF INVESTIGATIONS; THE POWERS OF ARREST, SEARCH, AND SEIZURE; THE RIGHTS OF PERSONS DETAINED IN CUSTODY TO ACCESS TO LEGAL ADVICE, PROTECTION AGAINST COMPULSORY SELF-INCRIMINATION, SPEEDY ACCESS TO A JUSTICE OR MAGISTRATE, AND HUMANE AND DIGNIFIED TREATMENT; RIGHTS WITH RESPECT TO BAIL AND SPEEDY TRIAL; THE RIGHT TO REPRESENTATION AND OTHER MEANS OF ENSURING FAIR TRIALS; AND OTHER MATTERS. THE REPORT COVERS ARREST PROCEDURES; PROCEDURES SHORT OF ARREST; CUSTODY AND CUSTODIAL INVESTIGATION; QUESTIONING AND THE RIGHT TO SILENCE; RELEASE AND BAIL; SEARCH, SURVEILLANCE, AND ENTRAPMENT; USE OF CRIMINAL INTELLIGENCE DATA; SPECIAL PROBLEMS OF MINORITY GROUPS; SPECIAL PROBLEMS IN REMOTE AREAS; AND ENFORCEMENT OF RULES. THE THRUST OF THE PROPOSALS IS TOWARD RECOGNIZING, CONTROLLING, AND USING -- IN THE INTERESTS OF THE ACCUSED AS WELL AS THE AUTHORITIES -- MODERN TECHNOLOGY. THE PROPOSALS ALSO REFLECT AN ATTEMPT TO DEEMPHASIZE ARREST AND TO ENCOURAGE PROCEEDINGS BY SUMMONS. A BIBLIOGRAPHY, REFERENCES TO LEGISLATION AND COURT CASES, A DRAFT COPY OF PROPOSED CRIMINAL INVESTIGATION LEGISLATION, AND AN INDEX ARE INCLUDED. (LKM)