Last year, a man was pulled over in Solano County, Calif., by an agent with the California Department of Alcoholic Beverage Control for driving erratically.

According to the Guardian, which first reported on the case, the man was given a breathalyzer test which showed a zero alcohol reading. And a subsequent toxicology report also came back negative for any illicit drugs.

A second toxicology report performed did come back positive … for caffeine.

AirTalk guest host Patt Morrison talks with a couple experts to get to the bottom of the case.

Guests:

Nina Hodjat, Esq., managing attorney at Shield Legal Services, a law firm in Beverly Hills; she tweets @NinaHodjat

Jeffery Zehnder, a forensic toxicologist and founder of Drug Detection Laboratories, Inc, a  forensic toxicology lab in Sacramento, Calif.