It goes to your head

Hands-free earpieces for cellphones do not necessarily cut the brain’s
exposure to microwaves. Tests announced this week by Britain’s Consumers’
Association showed that two sets tripled the electric field strength in a dummy
head. This contradicts tests carried out for New Scientist, which found
field reductions of 70 per cent in other sets
(10 April 1999, p 24).
Ron Brooker, principal scientist at the CA’s labs, blames cellphone makers who allow
radio-frequency circuits to leak signals into the earpiece lead.