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ee She e cat LABONATORY — 2. \ FEDERAL CUNEAU C2 INVESTIGATION \ WASIINSTON, B,C. 20535 7 SAC, Houston (157-3433) Date: 5/24/74 FBI File No. F-15900 Re: HEARNAP; UNSUB; THREAT TO. Lab.nc. £-9099-OA ASSASSINATE GOVERNMENT OFFI CIALS, HOUSTON, TEXAS, OKLAHOMA; AND MICHIGAN, 4/4/74 EM - SLA‘ 00: HO \. Specimens received 5/3K74 Q1485 Gne Sony C-60 cassette taper marked "4/4/74 -KTRH, HO, TEX." Results of Examination: It was not possible to identify the voice of the unknown niale on Q1485 with male voices submitted previously in the Hearnap case. NO, Considerable low level background noise was noted in those portions of the Q1485 tape containing the unknown male voice. The bac kground nvise nchiacs a it ede MWAVeNe SuuLce consisting of tones at approximately 390, 540, 780 ahd 1160 hertz, plus additional tones covering wide bands of frequencies, The tones have duration of approximately .35 seconds spaced at..5 second intervals. The specific » source of these tones could not be ideitified. The Q1485 tape is being returned to your office under separate cover via register ed mail. \ a CAE ee ne Set caterer mn has fe Ng A ag eS 8