Ronay says that until now, airport screeners haven't had much experience looking for liquids that might create a bomb.

NPR: It's Hard to Spot a Liquid Threat to Airline Safety

Ronay says the problem for airports these days is that you can no longer just look for obvious things like timers and sticks of dynamite.

NPR: It's Hard to Spot a Liquid Threat to Airline Safety

Chris Ronay used to run the FBI Explosives Unit.

NPR: It's Hard to Spot a Liquid Threat to Airline Safety

"The work is done and the reports on those exams are sent back to the contributor and they are the only ones who receive the reports, " said Chris Ronay, a former FBI lab official.

CNN: Lewinsky Dress Test Results Are Washington's Biggest Secret

"The penalties are heavy, " said Ronay.

CNN: Lewinsky Dress Test Results Are Washington's Biggest Secret