President Bush is set to sign legislation that will help the federal government crack down on hundreds of rogue Internet pharmacies that peddle controlled substances like the painkiller Vicodin or the stimulant Ritalin.

The bill reflects growing concern among parents and public-health experts that certain online pharmacies enable almost anyone to purchase drugs with a few mouse clicks and without seeing a doctor or getting a valid prescription. Experts believe the Web sites are fueling an increase in the abuse of prescription drugs, especially among teenagers.

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