McCallum v. United States

holding that federal rules of evidence concerning hearsay do not apply to probation revocation hearings | roving patrol in remote, sparsely populated rural area condoned to thwart rash of burglaries | postjudgment interest allowed from date of original judgment on antitrust counterclaim, no discussion of prejudgment interest award | postjudgment interest allowed from date of original judgment on antitrust counterclaim, no discussion of prejudgment interest award | letter from parolee’s job coordinator to probation officer regarding parolee’s tardiness and absenteeism admissible because it was an official report and reliability was established by probationer’s corroboration | “Where the degree of substitutability in production is high, cross-elasticities of supply will also be high, and ... the two commodities in question should be treated as part of the same market.” | appeal of trial court judgment