The right of confrontation guaranteed by the Confrontation Clause of the Sixth Amendment to the U.S. Constitution puts no constraints on the admissibility of nontestimonial hearsay statements; the federal constitutional right of confrontation does not apply to such statements.

United States v. Lee, 249 F.3d 632, pin? (7th Cir. 2001) (accused, in attempt to deflect responsibility, offered to show that another possible culprit failed polygraph exam about the crime; on appeal, court said that there is no consensus about reliability of polygraph,...Polygraph test results are insufficiently reliable to be admissible.

Cf. United States v. Glenn, 312 F.3d 58, 67 (2d Cir. 2002) ("It is well-settled that flight can evidence consciousness of guilt. United States v. Salameh, 152 F.3d 88, 157 (2d Cir.1998) (per curiam). But the evidence at trial failed to prove flight.").Flight and escape from police officers, custody, prison, or government authorities has been held to be relevant under the circumstances when offered to show consciousness of, or belief in, criminal guilt.

United States v. Betts, 16 F.3d 748, 759 (7th Cir. 1994) (upholding trial court's admission of marijuana and related paraphernalia evidence which were seized from accused's home despite not being probative of accused's knowledge and intent of the charged conspiracy).When two or more similar or very similar acts occur and it is very improbable that the two or more acts would have occurred if they were not a person's criminal acts committed, in a criminal trial based on one of those acts, evidence of the other act or acts is admissible to show that the act for which defendant is on trial was a criminal act.