The following excerpt is from USA. v. Blackmon, 273 F.3d 1204 (9th Cir. 2001):
United States v. Brown, 761 F.2d 1272, 1276 (9th Cir. 1985) ("[T]telephone records, though raising suspicion that illegal activity was occurring, failed to identify specific users or reveal the substance of the conversations."); United States v. Brone, 792 F.2d 1504, 1506 (9th Cir. 1986) ("[P]en registers and toll records did not disclose the nature of the business being transacted by telephone.").
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