The sensor's imaging chip picks up the dark string immediately, even if only 1 femtogram (one-quadrillionth of a gram) of TNT is stuck to it.

FORBES

ENHANCE, involving 720 patients, began immediately in June 2002 and was modeled on an imaging study that had worked for Pfizer, called ASAP, conducted by John Kastelein of the University of the Netherlands.

FORBES: Vytorin On Trial