They're typically made of a metallic weave that can include carbon, lead and potassium. The devices are tiny, but their profit margins are huge. Scott Coloney, the CEO of Cellularguard, says that his per-shield cost is 80 cents. Many shieldmakers claim to eliminate nearly all handset radiation a dubious assertion because that would effectively squelch the phone's radio signal. Yet the press is buying this rhetoric without much scrutiny.
Independent tests suggest otherwise.
In November the Good Housekeeping Institute put five different shields through the same procedure used by the U.S. Federal Communications Commission to measure radiation from cell phones. Fill in this form for your free trial issue. U.S. indexes are real-time. Forbes 40 Index powered by Telemet . News may include latest headlines from Reuters.