al activity must not have been merely incidental to the trip. Adapted from Sand, et al., Modern Federal Jury Instructions, Instrs. and 64-4, 64-18; Edward J. Devitt et al., Federal Jury Practice and Instructions, Instr. 60-07; and the charge of the Hon. Denise L. Cote in United States v. Purcell, 18 Cr. 081 (DLC). See