The Importance of Foreign Hair in the Case of Jeffrey McDonald

"I can go into anybody's house and find foreign hairs, how many times have you had other people over to your house?" he asks. "And a fingerprint that was never matched to anybody who could have been the Maytag repair guy? We have no idea." The defense is always going after evidence that they think will prove their client's innocence because they have confidence it won't come back to them. But in this day and age, if I've got the intruder theory going on, there's a chance that I would be able to find foreign DNA on those items," McDonald says.