Their default is that if there's any credible evidence whatsoever, even in just a few studies, they'll put something on their 'possibly carcinogenic' list.

CNN: STORY HIGHLIGHTS

Among the agents classed in Group 2B, possibly carcinogenic, are coffee and DDT, both of which have been extensively studied and found not be linked to cancer.

FORBES: How Activism Distorts The Assessment Of Health Risks

Concerns resurfaced in May when the World Health Organization classified electromagnetic fields produced by mobile phones as "possibly carcinogenic to humans" after analyzing the body of scientific research.

CNN: STORY HIGHLIGHTS