Many hair straighteners have more formaldehyde than claimed, study says

Many hair straighteners have more formaldehyde than claimed, study says
http://latimesblogs.latimes.com/alltherage/2011/11/brazilian-blowout-hair-straighteners-formaldehyde.html 

"Three out of four keratin hair straighteners tested for a new study on formaldehyde exposure in hair-smoothing products contained more formaldehyde than the product claimed, according to research conducted by the San Francisco-based scientific consulting firm, ChemRisk, and published in the peer-reviewed Journal of Occupational and Environmental Hygiene."