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March 10, 1943 Re: Arrest, Detention and Interrogation of Persons in Cases Handied by the Federal Bureau of Investigetion The purpose of this memrandum ie to set forth the rules, regulations and practices of the Federal Bureau of Investigation in the arrest, detention and interrogation of persis involved in ericinal investigations, ARREST i, With warrants outstanding. Special agents of the Federal Bureau of Investigation are expowered by Section 300A, Title 5, United States Code, to serve warrants of arrest issued under the authority of the United States. Sections 2A and 28 of the Official vanual of Instructions of the Federal Bureau of Investigation, in the possession of all Special Agents, quote the above nentloned statute and provide by way of policy that in ordinary cases the warrants of arrest are actually served by the United States Marshal after the subject has been located by FBI Agents. In sore situations where a representative of the United States Varsrhal ies not readily available Special Agents of the FBI actually arrest the subjects under the power granted in the above mentioned statute. In other instances loml police authorities place the persons for whou warrants of arrest in FBI cases have been isaued in State eustedy until a United States Marshal is available. ) f] dead at k 2. Without warrants re el Special Agente of the Federal Bureau of Investigation are enpowered by Section 300A, Title 5, United States Code, to make arrests without warrants for Federal felonies in cases where the Agent has reasonable grounfi to believe the person arrested is guilty and where there is a likelihood of his escaping hefore a warrant can bea obtained, at! ; E Hy 1 i . i ae t : . ne + he it 1 te tre dew Dn nee! “bee The policy and practice of the FBI in securing the eustody of persons against whom no warrant has been issued when the requirements of Section 300A, Title 5, United States Code, are met dexand that where local authorities are requested to make the actual apprehension Federal prosecution must nave. been previously authorised by the United States Attorney. If a Special Agent is to make the actoal apprehension himself he must obtein prior euthority fron Bureau headquarters unless an emergency situation exists requiring instan- tnnanue antian_ ae 2S Ly we ewe Ca The above require.ents are set fort’. in Section ac of the official anual of instructions. PUNE DESTROYED or . . - 1 - . - _ # » liwov 6 1964 Ga FE Ds tye por