After several reported deaths and illnesses, the blood-thinner heparin was recalled and has been under intense FDA scrutiny for several months. Federal drug regulators revealed this week that they have found the contaminant in the medication. An inexpensive and unapproved ingredient was included in the medication; it eluded detection until recently because the ingredient mimics the proper component.

At this point federal officials are not certain if the contaminant (an altered form of chondroitin sulfate) was introduced accidentally or if it was included intentionally. The contaminated heparin was sourced in China; traders and producers there say that the chondroitin sulfate is significantly cheaper than heparin -- as little as 1/20 the cost of heparin.