Although both are made from petroleum jelly, only one of them has potentially explosive material.
According to Air Force officials, the 20.5 foot-long MOP carries over 5, 300 pounds of explosive material.
Each shell contains a small amount of explosive material, and some is used to produce whistles and other effects.
The Laser Avenger, which is being developed by Boeing, is a vehicle-mounted system that can slowly heat explosive material from several hundred metres.
Dutch authorities have said they are confident about how AbdulMutallab was screened but acknowledge that they could not have detected the explosive material that he was said to be carrying.
Ter Horst said that security measures in place in Amsterdam were metal detectors and X-ray machines, and admitted they could not have picked up the explosive material that AbdulMullatab was allegedly carrying.
CNN: Dutch, Nigerians to use full body scans for air travelers
The late Peter Roebuck, one of the world's greatest cricket writers, once exclaimed that removing Rahul Dravid from the crease would possibly need gelignite, an explosive material invented by Alfred Nobel.
In testimony Tuesday, FBI forensic chemist Kelly Mount told the jury that clothing found in the travel bag of defendant Mohamed Sadeek Odeh, accused in the bombing in Kenya, contained traces of explosive material.
John Conkling, a chemist with decades of experience in fireworks, said the photograph included with the latest criminal complaints "clearly showed they were taking apart consumer fireworks, " probably to get to the explosive material inside.
"This is because a substantial quantity of potentially explosive pharmaceutical material - Isosorbide Dinitrate (ISDN Pure) - has been identified on the site following a recent joint inspection by the Health and Safety Executive (HSE) and Environment Agency Wales, " explained the council officer.
BBC: Euticals: Flintshire council letters over chemical find
In a statement, the council's chief executive, Colin Everett, said "a substantial quantity of potentially explosive pharmaceutical material - Isosorbide Dinitrate (ISDN Pure) - has been identified on the site following a recent joint inspection by the Health and Safety Executive (HSE) and Environment Agency Wales".
BBC: Euticals, Sandycroft: Chemicals apology and reassurance
What if the desensitising material is itself an explosive of lower sensitivity?
ECONOMIST: A new hybrid explosive is safer to handle but still powerful
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