In United States v. Doerr, 886 F.2d 944, 954-55 (7th Cir.1989), the Court enumerated seven factors that should be considered in determining whether hearsay testimony has sufficient guarantees of trustworthiness: " the character of the witness for truthfulness and honesty, and the availability of evidence on the issue; whether the testimony was given voluntarily, under oath, subject to cross-examination and a penalty for perjury; the witness' relationship with both the defendant and the government and his motivation to testify ...; the extent to which the witness' testimony reflects his personal knowledge; whether the witness ever recanted his testimony; the existence of corroborating evidence; and, the reasons for the witness' unavailability." (Doerr, 886 F.2d at 956.)