Privacy-conscious users who know how to find and delete regular cookies might have trouble locating supercookies.

WSJ: Latest in Web Tracking: Stealthy 'Supercookies'

Robert Dennis had a lot of trouble locating pay phones in his home of Coral Springs, Florida.

CNN: Pay phones: The search for an endangered species

They have trouble locating 5 customers from the past 12 months who have hired them for similar services.

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