would never believe and never suspect. reporter: in the fight to stop fakes the fda gets help from pharmaceutical giants like pfizer. they know counterfeits can help the bottom line. john clark says his people found counterfeit versions of 60 different pfizer drugs from last year. that s up to 20 from 2008. the better counterfeiters might put in 10, 20 even 30% of the active pharmaceutical ingredient that s supposed to be in the medicine. reporter: they test,0 thousas of products a year. it found fake cancer, fake heart, fake cancer drugs and even fake chapstick. they will do a number of testing. fp the packaging doesn t