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Exec AD Adm, Memorandum fn aD use 1- Mr. Kelleher 1- Mr. Cronin = tntatl. . Laboratery to :Mr. Cronin tat Date 7/14/81 Pav gtena Rec. Mgnt, __ Tech. Servs. __ From :R. W. Aaron OA Ot alone Pa \ & Public Atfs._ { ey i] Telephone Rm. Subject -ATKID (7-18251) Peseta Seety — ---MAJOR CASE #30 OO: ATLANTA PURPOSE: To advise of the status of toxicological work in ATKID. DETAILS: Complete toxicological examinations have been conducted on specimens from victims Timothy Hill, Larry Rogers and William Barrett. Tissues from Michael McIntosh and Nathaniel Cater were examined for dimethylsulfoxide. A general screening examination is being conducted on .__ tissues from Nathaniel Cater, the victim for whose murder a suspect has been charged. This examination is restricted due to the poor quality of the~. submitted specimens. None of these examinations have indicated a drug, ‘. poison or other unnatural chemical substance. bp’ While all logical courses have been pursued and test conducted were as thorough as possible, there remain many thousands of compounds which could have been used and still escape detection in these screening procedures. At this point the task becomes a matter of a random selection of one of these unique substances and conducting tests specific for that substance. The tests for each material would take hours to weeks. In the absence of specific leads, this would appear to be unreasonably inefficient. The Atlanta Office has been requested to review the background of the chief suspect in the case for names of any particular drugs or other chemicals with which he may be associated. No such substances have been developed to ae my Oe fe RECOMMENDATION: That upon completion of the ¢xaminations on Cater's tissues, no further examinations should be conducted without specific leads developed through investigations ongoing in Atlanta. The tissues will be retained in the Laboratory for six months against the possibility of the need for additional tests. | ces eo APPROVED: Adm. Servs. Laboratory Crim. inv. Legal Coun os Jl 36 1991 1 - 7-18251 Director Rec. Mgnt. T= TBR Dog Pe — : — Exec. AD-Agm.____ent. Ton Servs. ee (ee thi ee - Exec. AD-Inv. Inspection___—_soofr. ——— \ ‘ Exec. AD-LES _____intelll. & Public Afts, RWA:bld ° 247 S34