Court of Appeals for the Seventh Circuit February 25, 2003, 02-2128 (United States v. Christopher J. Bitterman)

COFFEY, Circuit Judge.

On December 19, 2001, Defendant-Appellant Christopher Bitterman (“Bitter-man”) was convicted before a jury of armed bank robbery and now appeals his conviction, arguing that the district court erred by: (1) excluding certain testimony as “collateral” that Bitterman claims had impeachment value; (2) allowing the prosecution to “place an undue influence” on Bitterman’s heroin