"According to the owner, this tire is brand new and there was no reason for it to blow. Caused a six-car pile up on I-15," he says, studying Barry warily.

"Really? Mind if I look?" Sara takes part of the tire and examines it under one of the larger microscopes.

"Sabotage," she says a few minutes later. "There are half a dozen needle punctures on this piece alone. Barry?" She moves aside.